diff --git a/breathe/directives/class_like.py b/breathe/directives/class_like.py
index aae52cab..9d5a415a 100644
--- a/breathe/directives/class_like.py
+++ b/breathe/directives/class_like.py
@@ -26,6 +26,7 @@ class _DoxygenClassLikeDirective(BaseDirective):
         "show": unchanged_required,
         "outline": flag,
         "no-link": flag,
+        "noindex": flag,
         "allow-dot-graphs": flag,
     }
     has_content = False
diff --git a/breathe/directives/item.py b/breathe/directives/item.py
index 8f8dc3ef..01de4b0e 100644
--- a/breathe/directives/item.py
+++ b/breathe/directives/item.py
@@ -20,6 +20,7 @@ class _DoxygenBaseItemDirective(BaseDirective):
         "project": unchanged_required,
         "outline": flag,
         "no-link": flag,
+        "noindex": flag,
     }
     has_content = False