diff --git a/etiquette/photodb.py b/etiquette/photodb.py
index 5809a7d..964ced8 100644
--- a/etiquette/photodb.py
+++ b/etiquette/photodb.py
@@ -550,6 +550,7 @@ class PDBPhotoMixin:
             tag_mays=None,
             tag_forbids=None,
             tag_expression=None,
+            within_directory=None,
 
             limit=None,
             offset=None,
@@ -628,6 +629,11 @@ class PDBPhotoMixin:
             'family AND (animals OR vacation)'
             'family vacation outdoors' (implicitly AND each term)
 
+        within_directory:
+            A string or list of strings or pathclass Paths of directories.
+            Photos MUST have a `filepath` that is a child of one of these
+            directories.
+
         QUERY OPTIONS
         limit:
             The maximum number of *successful* results to yield.
@@ -675,6 +681,7 @@ class PDBPhotoMixin:
         has_thumbnail = searchhelpers.normalize_has_thumbnail(has_thumbnail)
         is_searchhidden = searchhelpers.normalize_is_searchhidden(is_searchhidden)
         mimetype = searchhelpers.normalize_extension(mimetype)
+        within_directory = searchhelpers.normalize_within_directory(within_directory, warning_bag=warning_bag)
         yield_albums = searchhelpers.normalize_yield_albums(yield_albums)
 
         if has_tags is False:
@@ -761,6 +768,7 @@ class PDBPhotoMixin:
                 'tag_mays': tag_mays or None,
                 'tag_forbids': tag_forbids or None,
                 'tag_expression': giveback_tag_expression or None,
+                'within_directory': within_directory or None,
                 'limit': limit,
                 'offset': offset or None,
                 'orderby': giveback_orderby or None,
@@ -802,6 +810,17 @@ class PDBPhotoMixin:
         if mimetype:
             notnulls.add('extension')
 
+        if within_directory:
+            patterns = {f'{d.absolute_path}{os.sep}%' for d in within_directory}
+            clauses = ['filepath LIKE ?'] * len(patterns)
+            if len(clauses) > 1:
+                clauses = ' OR '.join(clauses)
+                clauses = f'({clauses})'
+            else:
+                clauses = clauses.pop()
+            wheres.append(clauses)
+            bindings.extend(patterns)
+
         if has_tags is True:
             wheres.append('EXISTS (SELECT 1 FROM photo_tag_rel WHERE photoid == photos.id)')
         if has_tags is False:
diff --git a/etiquette/searchhelpers.py b/etiquette/searchhelpers.py
index 922ce08..a8aed61 100644
--- a/etiquette/searchhelpers.py
+++ b/etiquette/searchhelpers.py
@@ -9,6 +9,7 @@ from . import helpers
 from . import objects
 
 from voussoirkit import expressionmatch
+from voussoirkit import pathclass
 from voussoirkit import sqlhelpers
 
 def expand_mmf(tag_musts, tag_mays, tag_forbids):
@@ -385,6 +386,36 @@ def normalize_tag_expression(expression):
 
     return expression
 
+def normalize_within_directory(paths, warning_bag=None):
+    if paths is None:
+        return set()
+
+    if isinstance(paths, set):
+        pass
+    elif isinstance(paths, (str, pathclass.Path)):
+        paths = {paths}
+    elif isinstance(paths, (list, tuple)):
+        paths = set(paths)
+    else:
+        exc = TypeError(paths)
+        if warning_bag:
+            warning_bag.add(exc)
+            return set()
+        else:
+            raise exc
+
+    paths = {pathclass.Path(p) for p in paths}
+    directories = {p for p in paths if p.is_dir}
+    not_directories = paths.difference(directories)
+    if not_directories:
+        exc = pathclass.NotDirectory(not_directories)
+        if warning_bag:
+            warning_bag.add(exc)
+        else:
+            raise exc
+
+    return directories
+
 def normalize_yield_albums(yield_albums):
     '''
     See etiquette.helpers.truthystring.
diff --git a/frontends/etiquette_flask/backend/endpoints/photo_endpoints.py b/frontends/etiquette_flask/backend/endpoints/photo_endpoints.py
index 95247b4..eb39b19 100644
--- a/frontends/etiquette_flask/backend/endpoints/photo_endpoints.py
+++ b/frontends/etiquette_flask/backend/endpoints/photo_endpoints.py
@@ -387,6 +387,9 @@ def get_search_core():
     search_generator = common.P.search(**search_kwargs)
     # Because of the giveback, first element is cleaned up kwargs
     search_kwargs = next(search_generator)
+    # Web UI users aren't allowed to use within_directory anyway, so don't
+    # show it to them.
+    search_kwargs.pop('within_directory', None)
     # print(search_kwargs)
 
     warnings = set()