| Abbreviation | Definition |
|---|---|
| BDE | British Destroyer Escort |
| BGS | Big Gray Ship |
| BM | Monitor (Battleship type, Monitor sub-type) |
| BU | Broken Up (scrapped) |
| C | Canoe |
| C/C | Cabin Cruiser |
| C/F | Car Ferry |
| C/S | Container Transport Vessel |
| CA | Heavy Cruiser (Cruiser, Armored) |
| CAG | Guided-missile Heavy Cruiser |
| CAM | Catapult Armed Merchantman |
| CB | Battle Cruiser (Cruiser, Battle) |
| CBS | California Block Stowage |
| CC | BattleCruiser (1920) |
| CC | Command Cruiser (1960) |
| CCB | Command and Control Boat |
| CF | Flotilla Cruiser (Cruiser, destroyer Flotilla) |
| CFA | Charles F. Adams (DDG-2 class guided missile destroyers) |
| CGN | Guided-missile Cruiser, Nuclear powered |
| CGNR/33 | Coast Guard Number/33 |