- Benefield Castle
- Benington Castle
- Biggleswade Castle
- Bishop's Palace, Paignton
- Bitchfield Tower
- Bolebroke Castle
- Bothal Castle
- Bourn Castle
- Bourne Castle
- Brandon Castle
- Bredwardine Castle
- Brightwell Castle
- Brimpsfield Castle
- Brinklow Castle
- Bromwich Castle
- Bronsil Castle
- Bryn Amlwg Castle
- Buckingham Castle
- Burley Castle
- Burton in Lonsdale Castle
- Buttercrambe Castle
- Bytham Castle
- Bywell Castle
C
edit- Cainhoe Castle
- Carlton Castle
- Cartington Castle
- Castle Combe Castle
- Castle Ditches
- Castle Tump, Dymock
- Chalgrave Castle
- Charlton Castle
- Cheney Longville Castle
- Chipchase Castle
- Claxton Castle
- Cleobury Castle
- Cockermouth Castle
- Cockle Park Tower
- Corbridge Vicar's Pele
- Cotherstone Castle
- Craster Tower
- Cuckney Castle