H
- "Happy Valley" – USS Valley Forge
- "He-Cat" - HMS Hecate; humorous malapropism
- "HMAS Can Opener" - HMAS Melbourne; given by US Navy sailors for the ships part in the sinking of the US Navy destroyer USS Frank E. Evans.
- HMS Refit - HMS Renown;
- HMS Repair - HMS Repulse
- "Hiroshima" - Soviet submarine K-19, due to a nuclear accident onboard
- "Holiday Express" – USS Bunker Hill
- "HST" – USS Harry S. Truman; initials of the ship's namesake Harry S. Truman
- "Hymi G" - USS Hyman G. Rickover
Read more about this topic: List Of Warships By Nickname