diff --git a/swh/web/browse/snapshot_context.py b/swh/web/browse/snapshot_context.py
--- a/swh/web/browse/snapshot_context.py
+++ b/swh/web/browse/snapshot_context.py
@@ -740,6 +740,13 @@
     browse_rev_link = gen_revision_link(revision_id)
     browse_snp_link = gen_snapshot_link(snapshot_id)
 
+    revision_found = True
+    if sha1_git is None:
+        try:
+            service.lookup_revision(revision_id)
+        except NotFoundExc:
+            revision_found = False
+
     dir_metadata = {
         "directory": sha1_git,
         "context-independent directory": browse_dir_link,
@@ -748,6 +755,7 @@
         "sum of regular file sizes": sum_file_sizes,
         "path": dir_path,
         "revision": revision_id,
+        "revision_found": revision_found,
         "context-independent revision": browse_rev_link,
         "snapshot": snapshot_id,
         "context-independent snapshot": browse_snp_link,
diff --git a/swh/web/templates/includes/directory-display.html b/swh/web/templates/includes/directory-display.html
--- a/swh/web/templates/includes/directory-display.html
+++ b/swh/web/templates/includes/directory-display.html
@@ -53,6 +53,11 @@
     </table>
   </div>
   <hr class="mt-0 mb-2">
+{% elif "revision_found" in swh_object_metadata and
+      swh_object_metadata.revision_found is False %}
+  <i>Revision {{ swh_object_metadata.revision }} could not be found in the archive.</i>
+  <br/>
+  <i>Its associated directory can not be displayed.</i>
 {% elif dirs|length == 0 and files|length == 0 %}
   <i>Directory is empty</i>
 {% endif %}
diff --git a/swh/web/tests/browse/views/test_origin.py b/swh/web/tests/browse/views/test_origin.py
--- a/swh/web/tests/browse/views/test_origin.py
+++ b/swh/web/tests/browse/views/test_origin.py
@@ -3,6 +3,7 @@
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+from datetime import datetime
 import random
 import re
 import string
@@ -12,7 +13,11 @@
 from hypothesis import given
 
 from swh.model.hashutil import hash_to_bytes
-from swh.model.model import Snapshot
+from swh.model.model import (
+    Snapshot,
+    SnapshotBranch,
+    TargetType,
+)
 from swh.web.browse.snapshot_context import process_snapshot_branches
 from swh.web.common.exc import NotFoundExc
 from swh.web.common.identifiers import get_swh_persistent_id
@@ -34,6 +39,7 @@
     revisions,
     origin_with_releases,
     release as existing_release,
+    unknown_revision,
 )
 
 
@@ -648,6 +654,39 @@
     )
 
 
+@given(new_origin(), unknown_revision())
+def test_origin_browse_directory_branch_with_non_resolvable_revision(
+    client, archive_data, new_origin, unknown_revision
+):
+    branch_name = "master"
+    snapshot = Snapshot(
+        branches={
+            branch_name.encode(): SnapshotBranch(
+                target=hash_to_bytes(unknown_revision), target_type=TargetType.REVISION,
+            )
+        }
+    )
+    new_origin = archive_data.origin_add([new_origin])[0]
+    archive_data.snapshot_add([snapshot])
+    visit = archive_data.origin_visit_add(new_origin["url"], datetime.now(), type="git")
+    archive_data.origin_visit_update(
+        new_origin["url"], visit.visit, status="full", snapshot=snapshot.id
+    )
+
+    url = reverse(
+        "browse-origin-directory",
+        url_args={"origin_url": new_origin["url"]},
+        query_params={"branch": branch_name},
+    )
+
+    resp = client.get(url)
+
+    assert resp.status_code == 200
+    assert_contains(
+        resp, f"Revision {unknown_revision } could not be found in the archive."
+    )
+
+
 def _origin_content_view_test_helper(
     client,
     origin_info,