diff --git a/assets/src/js/repos-with-multiple-projects-tablesorter.js b/assets/src/js/repos-with-multiple-projects-tablesorter.js
new file mode 100644
index 000000000..d6fa53a5e
--- /dev/null
+++ b/assets/src/js/repos-with-multiple-projects-tablesorter.js
@@ -0,0 +1,22 @@
+/* global $ */
+$(() => {
+  $("table").tablesorter({
+    theme: "bootstrap",
+    widthFixed: true,
+    sortReset: true,
+    widgets: ["filter", "columns"],
+    headers: {
+      0: { sortInitialOrder: "desc" },
+    },
+    widgetOptions: {
+      columns: ["table-info"],
+      filter_reset: ".reset",
+      filter_cssFilter: [
+        "form-control",
+        "form-control",
+        "form-control",
+        "form-control",
+      ],
+    },
+  });
+});
diff --git a/staff/urls.py b/staff/urls.py
index 4b674df27..1f40f9366 100644
--- a/staff/urls.py
+++ b/staff/urls.py
@@ -19,7 +19,7 @@
 from .views.dashboards.copiloting import Copiloting
 from .views.dashboards.index import DashboardIndex
 from .views.dashboards.projects import ProjectsDashboard
-from .views.dashboards.repos import PrivateReposDashboard
+from .views.dashboards.repos import PrivateReposDashboard, ReposWithMultipleProjects
 from .views.index import Index
 from .views.orgs import (
     OrgCreate,
@@ -91,7 +91,12 @@
     path("", DashboardIndex.as_view(), name="index"),
     path("copiloting/", Copiloting.as_view(), name="copiloting"),
     path("project/", ProjectsDashboard.as_view(), name="projects"),
-    path("repos", PrivateReposDashboard.as_view(), name="repos"),
+    path("repos/", PrivateReposDashboard.as_view(), name="repos"),
+    path(
+        "repos-with-multiple-projects/",
+        ReposWithMultipleProjects.as_view(),
+        name="repos-with-multiple-projects",
+    ),
 ]
 
 org_urls = [
diff --git a/staff/views/dashboards/repos.py b/staff/views/dashboards/repos.py
index ea659f78d..82caa6d1e 100644
--- a/staff/views/dashboards/repos.py
+++ b/staff/views/dashboards/repos.py
@@ -3,8 +3,8 @@
 
 import structlog
 from csp.decorators import csp_exempt
-from django.db.models import Count, Min
-from django.db.models.functions import Least
+from django.db.models import Count, Min, Prefetch
+from django.db.models.functions import Least, Lower
 from django.template.response import TemplateResponse
 from django.utils import timezone
 from django.utils.decorators import method_decorator
@@ -14,7 +14,7 @@
 from jobserver.authorization import CoreDeveloper
 from jobserver.authorization.decorators import require_role
 from jobserver.github import _get_github_api
-from jobserver.models import Project, Workspace
+from jobserver.models import Project, Repo, Workspace
 
 
 logger = structlog.get_logger(__name__)
@@ -136,3 +136,44 @@ def select(repo):
         return TemplateResponse(
             request, "staff/dashboards/repos.html", {"repos": repos}
         )
+
+
+@method_decorator(require_role(CoreDeveloper), name="dispatch")
+class ReposWithMultipleProjects(View):
+    @csp_exempt
+    def get(self, request, *args, **kwargs):
+        def iter_repos():
+            repos = (
+                Repo.objects.annotate(
+                    project_count=Count("workspaces__project", distinct=True)
+                )
+                .filter(project_count__gte=2)
+                .prefetch_related(
+                    Prefetch(
+                        "workspaces",
+                        Workspace.objects.order_by("name"),
+                        to_attr="ordered_workspaces",
+                    ),
+                    # Prefetch(
+                    #     "workspaces__project", Project.objects.all(), to_attr="derp"
+                    # ),
+                )
+                .order_by(Lower("url"))
+            )
+
+            for repo in repos:
+                projects = Project.objects.filter(workspaces__repo=repo).distinct()
+                yield {
+                    "has_github_outputs": repo.has_github_outputs,
+                    "name": repo.name,
+                    "projects": projects,
+                    "quoted_url": repo.quoted_url,
+                    "workspaces": repo.ordered_workspaces,
+                }
+
+        repos = list(iter_repos())
+        return TemplateResponse(
+            request,
+            "staff/dashboards/repos_with_multiple_projects.html",
+            {"repos": repos},
+        )
diff --git a/templates/staff/dashboards/index.html b/templates/staff/dashboards/index.html
index 526f7edf7..7da379dd9 100644
--- a/templates/staff/dashboards/index.html
+++ b/templates/staff/dashboards/index.html
@@ -50,7 +50,7 @@ <h5 class="card-title">Projects</h5>
         </div>
       </div>
 
-      <div class="card">
+      <div class="card mb-3">
         <div class="card-body">
           <h5 class="card-title">Repos</h5>
           <p class="card-text">
@@ -61,6 +61,16 @@ <h5 class="card-title">Repos</h5>
         </div>
       </div>
 
+      <div class="card mb-3">
+        <div class="card-body">
+          <h5 class="card-title">Repos with multiple projects</h5>
+          <p class="card-text">
+            Repos with multiple projects.
+          </p>
+          <a href="{% url 'staff:dashboards:repos-with-multiple-projects' %}" class="btn btn-primary">View</a>
+        </div>
+      </div>
+
     </div>
   </div>
 </div>
diff --git a/templates/staff/dashboards/repos_with_multiple_projects.html b/templates/staff/dashboards/repos_with_multiple_projects.html
new file mode 100644
index 000000000..748b8fc78
--- /dev/null
+++ b/templates/staff/dashboards/repos_with_multiple_projects.html
@@ -0,0 +1,123 @@
+{% extends "staff/base.html" %}
+
+{% load static %}
+
+{% block metatitle %}Repos with Multiple Projects: Staff Area | OpenSAFELY Jobs{% endblock metatitle %}
+
+{% block breadcrumbs %}
+<nav class="breadcrumb-container breadcrumb--danger" aria-label="breadcrumb">
+  <div class="container">
+    <ol class="breadcrumb rounded-0 mb-0 px-0">
+      <li class="breadcrumb-item">
+        <a href="{% url 'staff:index' %}">Staff area</a>
+      </li>
+      <li class="breadcrumb-item">
+        <a href="{% url 'staff:dashboards:index' %}">Dashboards</a>
+      </li>
+      <li class="breadcrumb-item active" aria-current="page">
+        Repos with multiple projects
+      </li>
+    </ol>
+  </div>
+</nav>
+{% endblock breadcrumbs %}
+
+{% block jumbotron %}
+<div class="jumbotron jumbotron-fluid jumbotron--danger pt-md-2">
+  <div class="container">
+    <h1 class="display-4">Repos with multiple projects</h1>
+    <p class="lead">
+      Repos with multiple projects on OpenSAFELY
+    </p>
+
+    <p>Remaining: {{ repos|length }}</p>
+  </div>
+</div>
+{% endblock jumbotron %}
+
+{% block staff_content %}
+<div class="container-fluid">
+  <div class="row">
+    <div class="col">
+      <button type="button" class="reset btn btn-outline-primary mb-3" data-column="0" data-filter="">Reset filters</button>
+      <div class="table-responsive">
+        <table class="table table-striped table-sm table--repo">
+          <thead>
+            <tr>
+              <th>Repo</th>
+              <th>Projects</th>
+              <th>Workspaces</th>
+              <th class="text-nowrap">Files released to GitHub</th>
+            </tr>
+          </thead>
+          <tbody>
+            {% for repo in repos %}
+            <tr>
+              <td><a href="{% url 'staff:repo-detail' repo_url=repo.quoted_url %}">{{ repo.name }}</a></td>
+
+              <td>
+                <details>
+                  <summary>
+                    <span class="summary--show">Show</span>
+                    <span class="summary--hide">Hide</span>
+                    {{ repo.projects|length }} projects
+                  </summary>
+                  <ul class="mt-1 mb-0 pl-2 ml-2">
+                    {% for project in repo.projects %}
+                    <li><a href="{{ project.get_staff_url }}">{{ project.name }}</a></li>
+                    {% endfor %}
+                  </ul>
+                </details>
+              </td>
+
+              <td>
+                {% if repo.workspaces|length > 1 %}
+                  <details>
+                    <summary>
+                      <span class="summary--show">Show</span>
+                      <span class="summary--hide">Hide</span>
+                      {{ repo.workspaces|length }} workspaces
+                    </summary>
+                    <ul class="mt-1 mb-0 pl-2 ml-2">
+                      {% for workspace in repo.workspaces %}
+                      <li>
+                        <a href="{{ workspace.get_staff_url }}">
+                          {{ workspace.name }}
+                        </a>
+                      </li>
+                      {% endfor %}
+                    </ul>
+                  </details>
+                {% else %}
+                  {% for workspace in repo.workspaces %}
+                    <a href="{{ workspace.get_staff_url }}">
+                      {{ workspace.name }}
+                    </a>
+                  {% endfor %}
+                {% endif %}
+              </td>
+
+              {% if repo.has_github_outputs %}
+                <td class="text-center text-danger font-weight-bold">YES</td>
+              {% else %}
+                <td class="text-center text-success">No</td>
+              {% endif %}
+            </tr>
+            {% endfor %}
+          </tbody>
+        </table>
+      </div>
+    </div>
+  </div>
+</div>
+{% endblock staff_content %}
+
+{% block extra_styles %}
+<link rel="stylesheet" href="{% static 'vendor/tablesorter/theme.bootstrap_4.min.css' %}">
+{% endblock %}
+
+{% block extra_js %}
+<script src="{% static 'vendor/tablesorter/jquery.tablesorter.min.js' %}"></script>
+<script src="{% static 'vendor/tablesorter/jquery.tablesorter.widgets.min.js' %}"></script>
+<script src="{% static 'js/repos-with-multiple-projects-tablesorter.js' %}"></script>
+{% endblock %}
diff --git a/tests/unit/staff/views/dashboards/test_repos.py b/tests/unit/staff/views/dashboards/test_repos.py
index afd24f654..33941c8d1 100644
--- a/tests/unit/staff/views/dashboards/test_repos.py
+++ b/tests/unit/staff/views/dashboards/test_repos.py
@@ -5,9 +5,18 @@
 from django.core.exceptions import PermissionDenied
 from django.utils import timezone
 
-from staff.views.dashboards.repos import PrivateReposDashboard
-
-from .....factories import JobFactory, JobRequestFactory, RepoFactory, WorkspaceFactory
+from staff.views.dashboards.repos import (
+    PrivateReposDashboard,
+    ReposWithMultipleProjects,
+)
+
+from .....factories import (
+    JobFactory,
+    JobRequestFactory,
+    ProjectFactory,
+    RepoFactory,
+    WorkspaceFactory,
+)
 from .....fakes import FakeGitHubAPI
 from .....utils import minutes_ago
 
@@ -89,3 +98,41 @@ def test_privatereposdashboard_unauthorized(rf):
 
     with pytest.raises(PermissionDenied):
         PrivateReposDashboard.as_view()(request)
+
+
+def test_reposwithmultipleprojects_success(
+    rf, django_assert_num_queries, core_developer
+):
+
+    # research-repo-1
+    repo1 = RepoFactory(url="https://github.com/opensafely/repo-1")
+    WorkspaceFactory(repo=repo1)
+    WorkspaceFactory(repo=repo1)
+
+    repo2 = RepoFactory(url="https://github.com/opensafely/repo-2")
+    WorkspaceFactory(repo=repo2)
+    WorkspaceFactory(repo=repo2)
+
+    repo3 = RepoFactory(url="https://github.com/opensafely/repo-3")
+    WorkspaceFactory.create_batch(5, repo=repo3, project=ProjectFactory())
+
+    request = rf.get("/")
+    request.user = core_developer
+
+    with django_assert_num_queries(2):
+        response = ReposWithMultipleProjects.as_view()(request)
+
+    assert response.status_code == 200
+
+    assert len(response.context_data["repos"]) == 2
+    assert {r["name"] for r in response.context_data["repos"]} == {
+        repo1.name,
+        repo2.name,
+    }
+
+
+def test_reposwithmultipleprojects_unauthorized(rf):
+    request = rf.get("/")
+    request.user = AnonymousUser()
+    with pytest.raises(PermissionDenied):
+        ReposWithMultipleProjects.as_view()(request)