Castelnau
- Castelnau Lake
- Castelnau, London
- Castelnau-Barbarens
- Castelnau-Chalosse
- Castelnau-Durban
- Castelnau-Magnoac
- Castelnau-Montratier
- Castelnau-Montratier (delegated commune)
- Castelnau-Picampeau
- Castelnau-Pégayrols
- Castelnau-Rivière-Basse
- Castelnau-Tursan
- Castelnau-Valence
- Castelnau-d'Anglès
- Castelnau-d'Arbieu
- Castelnau-d'Aude
- Castelnau-d'Auzan
- Castelnau-d'Estrétefonds
- Castelnau-de-Brassac
- Castelnau-de-Guers
- Castelnau-de-Lévis
- Castelnau-de-Mandailles
- Castelnau-de-Montmiral
- Castelnau-de-Médoc
- Castelnau-le-Lez
- Castelnau-sur-Gupie
- Castelnau-sur-l'Auvignon
- Castelnaud-de-Gratecambe
- Castelnaud-la-Chapelle
- Château de Castelnau-Bretenoux
- Châteauneuf (disambiguation)
- De Castelnau station
- Emmanuel Boileau de Castelnau
- François-Louis Laporte, comte de Castelnau
- Michel de Castelnau
- Neuburg (disambiguation)
- Neuchâtel
- Neufchâtel (disambiguation)
- Newcastle (disambiguation)
- Noël Édouard, vicomte de Curières de Castelnau
- Saint-Michel-de-Castelnau