- C: Cruiser (pre-1920 Protected Cruisers and Peace Cruisers)
- CA: (first series) Cruiser (retired, composed all surviving pre-1920 Protected and Peace Cruisers)
- CA: (second series) Heavy Cruiser, category later renamed Gun Cruiser (retired)
- CAG: Heavy Cruiser, Guided Missile (retired)
- CB: Large cruiser (retired)
- CBC: Large Command Cruiser (retired, never used operationally)
- CC: Battlecruiser (retired, never used operationally)
- CC: (second usage) Command Cruiser (retired); cruiser
- CG: Guided Missile Cruiser
- CGN: Guided Missile Cruiser (Nuclear-Propulsion)
- CL: Light Cruiser (retired)
- CLAA: Antiaircraft Cruiser (retired)
- CLG: Light Cruiser, Guided Missile (retired)
- CLGN: Light Cruiser, Guided Missile (Nuclear propulsion) (retired)
- CLK: Hunter-Killer Cruiser (abolished 1951)
- CM: Minelayer
- CMc: Coastal Minelayer
- CS: Scout Cruiser (retired)
- CSGN: Strike Cruiser (Proposed, never used operationally)
- CV: Aircraft Carrier
- CVA: Attack Aircraft Carrier (retired)
- CVB: Large Aircraft Carrier (category merged into CVA, 1952)
- CVE: Escort aircraft carrier (retired) (1943-retirement of type)
- CVF: Future Aircraft carrier (used briefly for Queen Elizabeth class aircraft carrier)
- CVHA: Assault Helicopter Aircraft Carrier (retired in favor of various L-series amphibious assault ship hull codes)
- CVHE: Escort Aircraft Carrier, Helicopter (retired)
- CVL: Light aircraft carrier (retired)
- CVN: Aircraft Carrier (Nuclear-Propulsion)
- CVS: Antisubmarine Aircraft Carrier (retired)
- CVT: Training Aircraft Carrier (changed to AVT (Auxiliary))
- CVU: Utility Aircraft Carrier (retired)
Read more about this topic: List Of Hull Classifications