diff --git a/src/app.py b/src/app.py
index 0b33386..5bb5ec3 100644
--- a/src/app.py
+++ b/src/app.py
@@ -144,6 +144,7 @@ def register_setup_check(app: Flask) -> None:
             "participant.magic_login",
             "participant.dashboard",
             "participant.logout",
+            "participant.profile_edit",
         ]:
             return
 
diff --git a/src/forms/participant.py b/src/forms/participant.py
index 91df24d..9a1cb9f 100644
--- a/src/forms/participant.py
+++ b/src/forms/participant.py
@@ -48,3 +48,25 @@ class MagicLinkRequestForm(FlaskForm):
             Length(max=255, message="Email must be less than 255 characters"),
         ],
     )
+
+
+class ProfileUpdateForm(FlaskForm):
+    """Form for updating participant profile."""
+
+    name = StringField(
+        "Name",
+        validators=[
+            DataRequired(message="Name is required"),
+            Length(min=1, max=255, message="Name must be 1-255 characters"),
+        ],
+        description="Your display name (visible to other participants)",
+    )
+
+    gift_ideas = TextAreaField(
+        "Gift Ideas",
+        validators=[
+            Length(max=10000, message="Gift ideas must be less than 10,000 characters")
+        ],
+        description="Optional wishlist or gift preferences for your Secret Santa",
+        render_kw={"rows": 6, "maxlength": 10000},
+    )
diff --git a/src/routes/participant.py b/src/routes/participant.py
index 7fa5d80..c592c60 100644
--- a/src/routes/participant.py
+++ b/src/routes/participant.py
@@ -17,7 +17,11 @@ from flask import (
 
 from src.app import db
 from src.decorators.auth import participant_required
-from src.forms.participant import MagicLinkRequestForm, ParticipantRegistrationForm
+from src.forms.participant import (
+    MagicLinkRequestForm,
+    ParticipantRegistrationForm,
+    ProfileUpdateForm,
+)
 from src.models.exchange import Exchange
 from src.models.magic_token import MagicToken
 from src.models.participant import Participant
@@ -341,10 +345,78 @@ def dashboard(id: int):  # noqa: A002
     if not participant:
         abort(404)
 
+    # Get list of active participants
+    from src.utils.participant import can_update_profile, get_active_participants
+
+    participants = get_active_participants(exchange.id)
+    can_edit = can_update_profile(participant)
+
     return render_template(
         "participant/dashboard.html",
         exchange=exchange,
         participant=participant,
+        participants=participants,
+        participant_count=len(participants),
+        can_edit_profile=can_edit,
+    )
+
+
+@participant_bp.route("/participant/profile/edit", methods=["GET", "POST"])
+@participant_required
+def profile_edit():
+    """Edit participant profile (name and gift ideas).
+
+    Only allowed before matching occurs.
+
+    Returns:
+        GET: Profile edit form
+        POST: Redirect to dashboard on success, or re-render form on error
+    """
+    from flask import current_app
+
+    # Get participant from session
+    participant = db.session.query(Participant).filter_by(id=session["user_id"]).first()
+    if not participant:
+        abort(404)
+
+    # Check if profile editing is allowed
+    from src.utils.participant import can_update_profile
+
+    if not can_update_profile(participant):
+        flash(
+            "Your profile is locked after matching. Contact the admin for changes.",
+            "error",
+        )
+        return redirect(url_for("participant.dashboard", id=participant.exchange_id))
+
+    # Create form with current values
+    form = ProfileUpdateForm(obj=participant)
+
+    if form.validate_on_submit():
+        try:
+            # Update participant
+            participant.name = form.name.data.strip()
+            participant.gift_ideas = (
+                form.gift_ideas.data.strip() if form.gift_ideas.data else None
+            )
+
+            db.session.commit()
+
+            flash("Your profile has been updated successfully.", "success")
+            return redirect(
+                url_for("participant.dashboard", id=participant.exchange_id)
+            )
+
+        except Exception as e:
+            db.session.rollback()
+            current_app.logger.error(f"Failed to update participant profile: {e}")
+            flash("Failed to update profile. Please try again.", "error")
+
+    return render_template(
+        "participant/profile_edit.html",
+        form=form,
+        participant=participant,
+        exchange=participant.exchange,
     )
 
 
diff --git a/src/templates/participant/dashboard.html b/src/templates/participant/dashboard.html
index 1a4b6e1..2927ae7 100644
--- a/src/templates/participant/dashboard.html
+++ b/src/templates/participant/dashboard.html
@@ -37,6 +37,28 @@
             <dd>{{ participant.gift_ideas }}</dd>
             {% endif %}
         </dl>
+
+        {% if can_edit_profile %}
+        <a href="{{ url_for('participant.profile_edit') }}">Edit Profile</a>
+        {% endif %}
+    </section>
+
+    <section>
+        <h2>Participants ({{ participant_count }})</h2>
+        {% if participants %}
+        <ul>
+            {% for p in participants %}
+            <li>
+                {{ p.name }}
+                {% if p.id == participant.id %}
+                <span class="badge">You</span>
+                {% endif %}
+            </li>
+            {% endfor %}
+        </ul>
+        {% else %}
+        <p>No other participants yet. Share the registration link!</p>
+        {% endif %}
     </section>
 
     <section>
diff --git a/src/templates/participant/profile_edit.html b/src/templates/participant/profile_edit.html
new file mode 100644
index 0000000..41f91e4
--- /dev/null
+++ b/src/templates/participant/profile_edit.html
@@ -0,0 +1,64 @@
+{% extends "layouts/base.html" %}
+
+{% block title %}Edit Profile - {{ exchange.name }}{% endblock %}
+
+{% block content %}
+<article>
+    <header>
+        <h1>Edit Your Profile</h1>
+        <p>Update your display name and gift ideas. Your Secret Santa will see this information after matching.</p>
+    </header>
+
+    <form method="POST" action="{{ url_for('participant.profile_edit') }}">
+        {{ form.hidden_tag() }}
+
+        <div>
+            {{ form.name.label }}
+            {{ form.name(class="form-control") }}
+            {% if form.name.errors %}
+            <ul class="field-errors">
+                {% for error in form.name.errors %}
+                <li>{{ error }}</li>
+                {% endfor %}
+            </ul>
+            {% endif %}
+            <small>{{ form.name.description }}</small>
+        </div>
+
+        <div>
+            {{ form.gift_ideas.label }}
+            {{ form.gift_ideas(class="form-control") }}
+            {% if form.gift_ideas.errors %}
+            <ul class="field-errors">
+                {% for error in form.gift_ideas.errors %}
+                <li>{{ error }}</li>
+                {% endfor %}
+            </ul>
+            {% endif %}
+            <small>{{ form.gift_ideas.description }}</small>
+            <small id="gift-ideas-count">
+                {{ (form.gift_ideas.data or '')|length }} / 10,000 characters
+            </small>
+        </div>
+
+        <div>
+            <button type="submit">Save Changes</button>
+            <a href="{{ url_for('participant.dashboard', id=exchange.id) }}">Cancel</a>
+        </div>
+    </form>
+</article>
+
+<script>
+// Character counter (progressive enhancement)
+document.addEventListener('DOMContentLoaded', function() {
+    const textarea = document.querySelector('textarea[name="gift_ideas"]');
+    const counter = document.getElementById('gift-ideas-count');
+
+    if (textarea && counter) {
+        textarea.addEventListener('input', function() {
+            counter.textContent = this.value.length + ' / 10,000 characters';
+        });
+    }
+});
+</script>
+{% endblock %}
diff --git a/src/utils/participant.py b/src/utils/participant.py
new file mode 100644
index 0000000..21e1cbb
--- /dev/null
+++ b/src/utils/participant.py
@@ -0,0 +1,55 @@
+"""Participant business logic utilities."""
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from src.models import Participant
+
+
+def get_active_participants(exchange_id: int) -> list["Participant"]:
+    """Get all active (non-withdrawn) participants for an exchange.
+
+    Args:
+        exchange_id: ID of the exchange
+
+    Returns:
+        List of active participants, ordered by name
+    """
+    from src.models.participant import Participant
+
+    result: list[Participant] = (
+        Participant.query.filter(
+            Participant.exchange_id == exchange_id, Participant.withdrawn_at.is_(None)
+        )
+        .order_by(Participant.name)
+        .all()
+    )
+    return result
+
+
+def is_withdrawn(participant: "Participant") -> bool:
+    """Check if participant has withdrawn.
+
+    Args:
+        participant: The participant to check
+
+    Returns:
+        True if withdrawn, False otherwise
+    """
+    return participant.withdrawn_at is not None
+
+
+def can_update_profile(participant: "Participant") -> bool:
+    """Check if participant can update their profile.
+
+    Profile updates are allowed until matching occurs.
+
+    Args:
+        participant: The participant to check
+
+    Returns:
+        True if profile updates are allowed, False otherwise
+    """
+    exchange = participant.exchange
+    allowed_states = ["draft", "registration_open", "registration_closed"]
+    return exchange.state in allowed_states
diff --git a/tests/conftest.py b/tests/conftest.py
index e066452..bc0fb8b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -75,3 +75,97 @@ def admin(db):
     db.session.add(admin)
     db.session.commit()
     return admin
+
+
+@pytest.fixture
+def exchange_factory(db):
+    """Factory for creating test exchanges.
+
+    Args:
+        db: Database instance.
+
+    Returns:
+        Function that creates and returns Exchange instances.
+    """
+    from datetime import UTC, datetime, timedelta
+
+    from src.models.exchange import Exchange
+
+    def _create(state="draft", **kwargs):
+        exchange = Exchange(
+            slug=kwargs.get("slug", Exchange.generate_slug()),
+            name=kwargs.get("name", "Test Exchange"),
+            budget=kwargs.get("budget", "$25-50"),
+            max_participants=kwargs.get("max_participants", 50),
+            registration_close_date=kwargs.get(
+                "registration_close_date", datetime.now(UTC) + timedelta(days=7)
+            ),
+            exchange_date=kwargs.get(
+                "exchange_date", datetime.now(UTC) + timedelta(days=14)
+            ),
+            timezone=kwargs.get("timezone", "UTC"),
+            state=state,
+        )
+        db.session.add(exchange)
+        db.session.commit()
+        return exchange
+
+    return _create
+
+
+@pytest.fixture
+def participant_factory(db, exchange_factory):
+    """Factory for creating test participants.
+
+    Args:
+        db: Database instance.
+        exchange_factory: Exchange factory fixture.
+
+    Returns:
+        Function that creates and returns Participant instances.
+    """
+    from src.models.participant import Participant
+
+    counter = {"value": 0}
+
+    def _create(exchange=None, **kwargs):
+        if not exchange:
+            exchange = exchange_factory()
+
+        counter["value"] += 1
+        participant = Participant(
+            exchange_id=exchange.id,
+            name=kwargs.get("name", f"Test Participant {counter['value']}"),
+            email=kwargs.get("email", f"test{counter['value']}@example.com"),
+            gift_ideas=kwargs.get("gift_ideas", "Test ideas"),
+            reminder_enabled=kwargs.get("reminder_enabled", True),
+            withdrawn_at=kwargs.get("withdrawn_at"),
+        )
+        db.session.add(participant)
+        db.session.commit()
+        return participant
+
+    return _create
+
+
+@pytest.fixture
+def auth_participant(client, exchange_factory, participant_factory):
+    """Create an authenticated participant session.
+
+    Args:
+        client: Flask test client.
+        exchange_factory: Exchange factory fixture.
+        participant_factory: Participant factory fixture.
+
+    Returns:
+        Authenticated participant instance.
+    """
+    exchange = exchange_factory(state="registration_open")
+    participant = participant_factory(exchange=exchange)
+
+    with client.session_transaction() as session:
+        session["user_id"] = participant.id
+        session["user_type"] = "participant"
+        session["exchange_id"] = exchange.id
+
+    return participant
diff --git a/tests/integration/test_participant_list.py b/tests/integration/test_participant_list.py
new file mode 100644
index 0000000..f967f5d
--- /dev/null
+++ b/tests/integration/test_participant_list.py
@@ -0,0 +1,135 @@
+"""Integration tests for participant list functionality."""
+
+from datetime import UTC, datetime
+
+from flask import url_for
+
+
+def test_participant_list_shows_all_active(
+    client, auth_participant, participant_factory
+):
+    """Test participant list shows all active participants."""
+    # auth_participant fixture creates session and one participant
+    exchange = auth_participant.exchange
+
+    # Create 2 more active participants
+    participant_factory(exchange=exchange, name="Bob")
+    participant_factory(exchange=exchange, name="Charlie")
+
+    response = client.get(url_for("participant.dashboard", id=exchange.id))
+
+    assert response.status_code == 200
+    assert b"Bob" in response.data
+    assert b"Charlie" in response.data
+    assert b"Participants (3)" in response.data
+
+
+def test_participant_list_excludes_withdrawn(
+    client, auth_participant, participant_factory
+):
+    """Test withdrawn participants are not shown."""
+    exchange = auth_participant.exchange
+
+    # Create active and withdrawn participants
+    participant_factory(exchange=exchange, name="Active")
+    participant_factory(
+        exchange=exchange, name="Withdrawn", withdrawn_at=datetime.now(UTC)
+    )
+
+    response = client.get(url_for("participant.dashboard", id=exchange.id))
+
+    assert response.status_code == 200
+    assert b"Active" in response.data
+    assert b"Withdrawn" not in response.data
+    # Count should be 2 (auth_participant + Active)
+    assert b"Participants (2)" in response.data
+
+
+def test_participant_list_shows_self_badge(client, auth_participant):
+    """Test participant list marks current user with badge."""
+    exchange = auth_participant.exchange
+
+    response = client.get(url_for("participant.dashboard", id=exchange.id))
+
+    assert response.status_code == 200
+    # Should show the participant's name
+    assert auth_participant.name.encode() in response.data
+    # Should show "You" badge
+    assert b"You" in response.data
+
+
+def test_participant_list_ordered_by_name(
+    client, auth_participant, participant_factory
+):
+    """Test participants are shown in alphabetical order."""
+    exchange = auth_participant.exchange
+
+    # Create participants with names that should be sorted
+    participant_factory(exchange=exchange, name="Zoe")
+    participant_factory(exchange=exchange, name="Alice")
+    participant_factory(exchange=exchange, name="Bob")
+
+    response = client.get(url_for("participant.dashboard", id=exchange.id))
+
+    assert response.status_code == 200
+    # Check order by finding positions in response
+    data = response.data.decode()
+    alice_pos = data.find("Alice")
+    bob_pos = data.find("Bob")
+    zoe_pos = data.find("Zoe")
+
+    # All should be present
+    assert alice_pos > 0
+    assert bob_pos > 0
+    assert zoe_pos > 0
+
+    # Should be in alphabetical order
+    assert alice_pos < bob_pos < zoe_pos
+
+
+def test_participant_list_empty_state(client, exchange_factory, participant_factory):
+    """Test message shown when only one participant."""
+    exchange = exchange_factory(state="registration_open")
+    participant = participant_factory(exchange=exchange)
+
+    # Create session for the only participant
+    with client.session_transaction() as session:
+        session["user_id"] = participant.id
+        session["user_type"] = "participant"
+        session["exchange_id"] = exchange.id
+
+    response = client.get(url_for("participant.dashboard", id=exchange.id))
+
+    assert response.status_code == 200
+    assert b"Participants (1)" in response.data
+    # Should show participant's own name
+    assert participant.name.encode() in response.data
+
+
+def test_participant_list_requires_auth(client, exchange_factory):
+    """Test participant list requires authentication."""
+    exchange = exchange_factory()
+
+    response = client.get(
+        url_for("participant.dashboard", id=exchange.id), follow_redirects=False
+    )
+
+    # Should redirect to login (or show error)
+    assert response.status_code in [302, 403]
+
+
+def test_participant_list_different_exchange(
+    client, auth_participant, exchange_factory, participant_factory
+):
+    """Test participants filtered by exchange."""
+    exchange1 = auth_participant.exchange
+    exchange2 = exchange_factory(state="registration_open")
+
+    # Create participant in different exchange
+    participant_factory(exchange=exchange2, name="Other Exchange")
+
+    response = client.get(url_for("participant.dashboard", id=exchange1.id))
+
+    assert response.status_code == 200
+    # Should not show participant from other exchange
+    assert b"Other Exchange" not in response.data
diff --git a/tests/integration/test_profile_update.py b/tests/integration/test_profile_update.py
new file mode 100644
index 0000000..2dc8d21
--- /dev/null
+++ b/tests/integration/test_profile_update.py
@@ -0,0 +1,120 @@
+"""Integration tests for profile update functionality."""
+
+from flask import url_for
+
+
+def test_profile_update_get_shows_form(client, auth_participant):
+    """GET shows edit form with current values."""
+    response = client.get(url_for("participant.profile_edit"))
+
+    assert response.status_code == 200
+    assert auth_participant.name.encode() in response.data
+    assert b"Edit Your Profile" in response.data
+
+
+def test_profile_update_post_success(client, auth_participant, db):
+    """POST updates profile successfully."""
+    response = client.post(
+        url_for("participant.profile_edit"),
+        data={"name": "Updated Name", "gift_ideas": "Updated ideas"},
+        follow_redirects=True,
+    )
+
+    assert response.status_code == 200
+    assert b"profile has been updated" in response.data
+
+    # Verify database
+    db.session.refresh(auth_participant)
+    assert auth_participant.name == "Updated Name"
+    assert auth_participant.gift_ideas == "Updated ideas"
+
+
+def test_profile_update_name_change(client, auth_participant, db):
+    """Name updates in database."""
+    original_name = auth_participant.name
+
+    client.post(
+        url_for("participant.profile_edit"),
+        data={"name": "New Name", "gift_ideas": ""},
+        follow_redirects=True,
+    )
+
+    db.session.refresh(auth_participant)
+    assert auth_participant.name == "New Name"
+    assert auth_participant.name != original_name
+
+
+def test_profile_update_locked_after_matching(
+    client, exchange_factory, participant_factory
+):
+    """Profile edit blocked after matching."""
+    exchange = exchange_factory(state="matched")
+    participant = participant_factory(exchange=exchange)
+
+    with client.session_transaction() as session:
+        session["user_id"] = participant.id
+        session["user_type"] = "participant"
+        session["exchange_id"] = exchange.id
+
+    response = client.get(url_for("participant.profile_edit"), follow_redirects=True)
+
+    assert b"profile is locked" in response.data
+
+
+def test_profile_update_form_validation_empty_name(client):
+    """Empty name shows validation error."""
+    response = client.post(
+        url_for("participant.profile_edit"), data={"name": "", "gift_ideas": "Test"}
+    )
+
+    assert response.status_code == 200
+    assert b"Name is required" in response.data
+
+
+def test_profile_update_requires_auth(client):
+    """Profile edit requires authentication."""
+    response = client.get(url_for("participant.profile_edit"), follow_redirects=False)
+
+    assert response.status_code == 403
+
+
+def test_profile_update_strips_whitespace(client, auth_participant, db):
+    """Whitespace is stripped from name and gift ideas."""
+    client.post(
+        url_for("participant.profile_edit"),
+        data={"name": "  Spaces  ", "gift_ideas": "  Gift  "},
+        follow_redirects=True,
+    )
+
+    db.session.refresh(auth_participant)
+    assert auth_participant.name == "Spaces"
+    assert auth_participant.gift_ideas == "Gift"
+
+
+def test_dashboard_shows_edit_link_when_allowed(client, auth_participant):
+    """Dashboard shows edit profile link when editing is allowed."""
+    response = client.get(
+        url_for("participant.dashboard", id=auth_participant.exchange_id)
+    )
+
+    assert response.status_code == 200
+    assert b"Edit Profile" in response.data
+
+
+def test_dashboard_hides_edit_link_after_matching(
+    client, exchange_factory, participant_factory
+):
+    """Dashboard hides edit profile link after matching."""
+    exchange = exchange_factory(state="matched")
+    participant = participant_factory(exchange=exchange)
+
+    with client.session_transaction() as session:
+        session["user_id"] = participant.id
+        session["user_type"] = "participant"
+        session["exchange_id"] = exchange.id
+
+    response = client.get(url_for("participant.dashboard", id=exchange.id))
+
+    assert response.status_code == 200
+    # Edit link should not be present
+    assert b"Edit Profile" not in response.data
diff --git a/tests/unit/test_participant_utils.py b/tests/unit/test_participant_utils.py
new file mode 100644
index 0000000..0ce1c5e
--- /dev/null
+++ b/tests/unit/test_participant_utils.py
@@ -0,0 +1,123 @@
+"""Unit tests for participant utility functions."""
+
+from datetime import UTC, datetime
+
+from src.utils.participant import (
+    can_update_profile,
+    get_active_participants,
+    is_withdrawn,
+)
+
+
+def test_get_active_participants_excludes_withdrawn(
+    exchange_factory, participant_factory
+):
+    """Test that get_active_participants excludes withdrawn participants."""
+    exchange = exchange_factory()
+
+    # Create 2 active, 1 withdrawn
+    active1 = participant_factory(exchange=exchange, name="Alice")
+    active2 = participant_factory(exchange=exchange, name="Bob")
+    withdrawn = participant_factory(
+        exchange=exchange, name="Charlie", withdrawn_at=datetime.now(UTC)
+    )
+
+    participants = get_active_participants(exchange.id)
+
+    assert len(participants) == 2
+    assert active1 in participants
+    assert active2 in participants
+    assert withdrawn not in participants
+
+
+def test_get_active_participants_ordered_by_name(exchange_factory, participant_factory):
+    """Test that participants are ordered alphabetically."""
+    exchange = exchange_factory()
+
+    participant_factory(exchange=exchange, name="Zoe")
+    participant_factory(exchange=exchange, name="Alice")
+    participant_factory(exchange=exchange, name="Bob")
+
+    participants = get_active_participants(exchange.id)
+
+    assert len(participants) == 3
+    assert participants[0].name == "Alice"
+    assert participants[1].name == "Bob"
+    assert participants[2].name == "Zoe"
+
+
+def test_get_active_participants_empty_when_all_withdrawn(
+    exchange_factory, participant_factory
+):
+    """Test that empty list returned when all participants withdrawn."""
+    exchange = exchange_factory()
+
+    participant_factory(exchange=exchange, withdrawn_at=datetime.now(UTC))
+    participant_factory(exchange=exchange, withdrawn_at=datetime.now(UTC))
+
+    participants = get_active_participants(exchange.id)
+
+    assert len(participants) == 0
+
+
+def test_get_active_participants_different_exchanges(
+    exchange_factory, participant_factory
+):
+    """Test that participants are filtered by exchange_id."""
+    exchange1 = exchange_factory()
+    exchange2 = exchange_factory()
+
+    participant_factory(exchange=exchange1, name="Alice")
+    participant_factory(exchange=exchange2, name="Bob")
+
+    participants = get_active_participants(exchange1.id)
+
+    assert len(participants) == 1
+    assert participants[0].name == "Alice"
+
+
+def test_is_withdrawn_true(participant_factory):
+    """Test is_withdrawn returns True for withdrawn participant."""
+    participant = participant_factory(withdrawn_at=datetime.now(UTC))
+    assert is_withdrawn(participant) is True
+
+
+def test_is_withdrawn_false(participant_factory):
+    """Test is_withdrawn returns False for active participant."""
+    participant = participant_factory()
+    assert is_withdrawn(participant) is False
+
+
+def test_can_update_profile_draft_state(participant_factory, exchange_factory):
+    """Profile updates allowed in draft state."""
+    exchange = exchange_factory(state="draft")
+    participant = participant_factory(exchange=exchange)
+    assert can_update_profile(participant) is True
+
+
+def test_can_update_profile_registration_open(participant_factory, exchange_factory):
+    """Profile updates allowed when registration open."""
+    exchange = exchange_factory(state="registration_open")
+    participant = participant_factory(exchange=exchange)
+    assert can_update_profile(participant) is True
+
+
+def test_can_update_profile_registration_closed(participant_factory, exchange_factory):
+    """Profile updates allowed when registration closed."""
+    exchange = exchange_factory(state="registration_closed")
+    participant = participant_factory(exchange=exchange)
+    assert can_update_profile(participant) is True
+
+
+def test_can_update_profile_matched_state(participant_factory, exchange_factory):
+    """Profile updates blocked after matching."""
+    exchange = exchange_factory(state="matched")
+    participant = participant_factory(exchange=exchange)
+    assert can_update_profile(participant) is False
+
+
+def test_can_update_profile_completed_state(participant_factory, exchange_factory):
+    """Profile updates blocked when completed."""
+    exchange = exchange_factory(state="completed")
+    participant = participant_factory(exchange=exchange)
+    assert can_update_profile(participant) is False