diff --git a/static/index.html b/static/index.html
index ea14cd7..b39963e 100644
--- a/static/index.html
+++ b/static/index.html
@@ -481,6 +481,10 @@
     <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M2 4h8l2 2h10v14H2z"/></svg>
     <span data-i18n="tab_workspaces">Spaces</span>
   </button>
+  <button class="mobile-nav-btn" data-panel="profiles" onclick="mobileSwitchPanel('profiles')">
+    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>
+    <span data-i18n="tab_profiles">Profiles</span>
+  </button>
 </nav>
 <div class="toast" id="toast"></div>
 <script src="/static/i18n.js"></script>
diff --git a/tests/test_mobile_layout.py b/tests/test_mobile_layout.py
index 2d41ba6..952c138 100644
--- a/tests/test_mobile_layout.py
+++ b/tests/test_mobile_layout.py
@@ -175,3 +175,34 @@ def test_composer_textarea_font_size_mobile():
     # Check for 16px font-size on the textarea in a mobile breakpoint
     assert re.search(r'font-size:16px', CSS), \
         "Composer textarea must have font-size:16px at mobile widths to prevent iOS zoom-on-focus"
+
+
+
+# ── Profiles button in mobile bottom nav ─────────────────────────────────────
+
+def test_mobile_profiles_button_present():
+    """Mobile bottom nav must include a Profiles button (PR #265)."""
+    assert 'data-panel="profiles"' in HTML and 'mobileSwitchPanel' in HTML, \
+        "Mobile nav must have a Profiles button with data-panel='profiles' and mobileSwitchPanel"
+
+
+def test_mobile_profiles_button_uses_mobileSwitchPanel():
+    """Profiles mobile nav button must use mobileSwitchPanel, not raw switchPanel."""
+    import re
+    match = re.search(
+        r'<button[^>]*mobile-nav-btn[^>]*data-panel="profiles"[^>]*>|'
+        r'<button[^>]*data-panel="profiles"[^>]*mobile-nav-btn[^>]*>',
+        HTML
+    )
+    assert match, "Could not find mobile-nav-btn with data-panel='profiles'"
+    btn_html = HTML[match.start():match.start()+300]
+    assert "mobileSwitchPanel('profiles')" in btn_html, \
+        "Profiles mobile nav button must call mobileSwitchPanel('profiles')"
+
+
+def test_mobile_profiles_button_is_last_in_nav():
+    """Profiles button must appear after Spaces in the mobile bottom nav."""
+    spaces_pos = HTML.find('data-panel="workspaces"')
+    profiles_pos = HTML.rfind('data-panel="profiles"')
+    assert spaces_pos > 0 and profiles_pos > spaces_pos, \
+        "Profiles button must appear after Spaces button in the mobile nav"