diff --git a/docs/groups-architecture.md b/docs/groups-architecture.md
index 27d9d18..1557b6f 100644
--- a/docs/groups-architecture.md
+++ b/docs/groups-architecture.md
@@ -961,6 +961,8 @@ Each functional unit can be implemented as a **separate issue**:
 ### Issue 4: Member Detail - Groups Display
 **Type:** Frontend  
 **Estimation:** 1-2h  
+**Status:** Implemented (Groups as data field in Personal Data, below Linked User; button-style links to `/groups/:slug`).
+
 **Tasks:**
 - Add groups section to member show
 - Display group badges
diff --git a/lib/mv_web/live/member_live/show.ex b/lib/mv_web/live/member_live/show.ex
index 40491cc..cc0b25e 100644
--- a/lib/mv_web/live/member_live/show.ex
+++ b/lib/mv_web/live/member_live/show.ex
@@ -12,6 +12,8 @@ defmodule MvWeb.MemberLive.Show do
   ## Sections
   - Personal Data: Name, address, contact information, membership dates, notes
   - Custom Fields: Dynamic fields in uniform grid layout (sorted by name)
+  - Groups: Group links (buttons) in Personal Data section, below Linked User
+  - Payment Data: Membership fee type and cycle status
   - Membership Fees: Tab showing all membership fee cycles with status management (via MembershipFeesComponent)
 
   ## Navigation
@@ -146,6 +148,28 @@ defmodule MvWeb.MemberLive.Show do
                   </div>
                 <% end %>
 
+                <%!-- Groups (in Personal Data, below Linked User) --%>
+                <div>
+                  <.data_field label={gettext("Groups")}>
+                    <%= if Enum.any?(@member.groups || []) do %>
+                      <div class="flex flex-wrap gap-2">
+                        <%= for group <- (@member.groups || []) do %>
+                          <.link
+                            navigate={~p"/groups/#{group.slug}"}
+                            class="btn btn-xs btn-outline btn-primary"
+                            role="status"
+                            aria-label={gettext("Member of group %{name}", name: group.name)}
+                          >
+                            {group.name}
+                          </.link>
+                        <% end %>
+                      </div>
+                    <% else %>
+                      <span class="text-base-content/70 italic">{gettext("No groups")}</span>
+                    <% end %>
+                  </.data_field>
+                </div>
+
                 <%!-- Notes --%>
                 <%= if @member.notes && String.trim(@member.notes) != "" do %>
                   <div>
@@ -262,7 +286,8 @@ defmodule MvWeb.MemberLive.Show do
         :user,
         :membership_fee_type,
         custom_field_values: [:custom_field],
-        membership_fee_cycles: [:membership_fee_type]
+        membership_fee_cycles: [:membership_fee_type],
+        groups: [:id, :name, :slug]
       ])
 
     member = Ash.read_one!(query, actor: actor)
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index 1784d4b..57334d2 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -2202,11 +2202,13 @@ msgstr "Gruppe erfolgreich gespeichert."
 #: lib/mv_web/live/components/member_filter_component.ex
 #: lib/mv_web/live/group_live/index.ex
 #: lib/mv_web/live/member_live/index.html.heex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Groups"
 msgstr "Gruppen"
 
 #: lib/mv_web/live/group_live/index.ex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "No groups"
 msgstr "Keine Gruppen"
@@ -2474,6 +2476,7 @@ msgid "unpaid"
 msgstr "Unbezahlt"
 
 #: lib/mv_web/live/member_live/index.html.heex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Member of group %{name}"
 msgstr "Mitglied der Gruppe %{name}"
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index af24afd..fb156df 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -2203,11 +2203,13 @@ msgstr ""
 #: lib/mv_web/live/components/member_filter_component.ex
 #: lib/mv_web/live/group_live/index.ex
 #: lib/mv_web/live/member_live/index.html.heex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Groups"
 msgstr ""
 
 #: lib/mv_web/live/group_live/index.ex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "No groups"
 msgstr ""
@@ -2475,6 +2477,7 @@ msgid "unpaid"
 msgstr ""
 
 #: lib/mv_web/live/member_live/index.html.heex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Member of group %{name}"
 msgstr ""
diff --git a/priv/gettext/en/LC_MESSAGES/default.po b/priv/gettext/en/LC_MESSAGES/default.po
index 88da6ff..1bf276c 100644
--- a/priv/gettext/en/LC_MESSAGES/default.po
+++ b/priv/gettext/en/LC_MESSAGES/default.po
@@ -2203,11 +2203,13 @@ msgstr ""
 #: lib/mv_web/live/components/member_filter_component.ex
 #: lib/mv_web/live/group_live/index.ex
 #: lib/mv_web/live/member_live/index.html.heex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Groups"
 msgstr ""
 
 #: lib/mv_web/live/group_live/index.ex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "No groups"
 msgstr ""
@@ -2475,6 +2477,7 @@ msgid "unpaid"
 msgstr ""
 
 #: lib/mv_web/live/member_live/index.html.heex
+#: lib/mv_web/live/member_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Member of group %{name}"
 msgstr ""
diff --git a/test/mv_web/member_live/show_groups_display_test.exs b/test/mv_web/member_live/show_groups_display_test.exs
index 78112ae..bda46b3 100644
--- a/test/mv_web/member_live/show_groups_display_test.exs
+++ b/test/mv_web/member_live/show_groups_display_test.exs
@@ -3,19 +3,15 @@ defmodule MvWeb.MemberLive.ShowGroupsDisplayTest do
   Tests for displaying groups in the member detail view (Issue #374).
 
   Tests cover:
-  - Groups section visibility (with and without groups)
-  - Group badges with correct names and links to group detail pages
+  - Groups in Personal Data (with and without groups)
+  - Group buttons with correct names and links to group detail pages
   - Edge cases (one group, many groups)
-  - Security: groups section visible only when user may view member
-  - Accessibility: badges have role and aria-label
+  - Security: groups visible only when user may view member
+  - Accessibility: group links have role and aria-label
 
   ## Note on async
   async: false to avoid PostgreSQL deadlocks when creating members and groups
   in the same test run (same as IndexGroupsDisplayTest).
-
-  ## Expected state
-  These tests fail until the Groups section is implemented on the member show page
-  (Issue #374: load groups in handle_params, add "Groups" section with badges and links).
   """
   use MvWeb.ConnCase, async: false
   import Phoenix.LiveViewTest
@@ -97,10 +93,11 @@ defmodule MvWeb.MemberLive.ShowGroupsDisplayTest do
       member: member
     } do
       conn = conn_with_oidc_user(conn)
-      {:ok, view, _html} = live(conn, ~p"/members/#{member}")
+      {:ok, _view, html} = live(conn, ~p"/members/#{member}")
 
-      # Assert Groups section in main content (section with h2 "Groups"), not sidebar link
-      assert has_element?(view, "main section h2", gettext("Groups"))
+      # Groups are in Personal Data; label "Groups" and empty state "No groups" must be present
+      assert html =~ gettext("Groups")
+      assert html =~ gettext("No groups")
     end
 
     test "groups are loaded with member (single request returns all group names)", %{