H
- Hafir (Egypt): 74-ton river gunboat
- Hai Fu (China): 166-ton gunboat
- Hai Ho (China): 211-ton river gunboat
- Hai Hung (China): 190-ton gunboat
- Hai Ku (China): 190-ton gunboat
- Hai Ou (China): 166-ton patrol boat
- Hai Peng (China): 211-ton river gunboat
- Hai Yen (China): 56-ton patrol boat
- Hämeenmaa (Finland): 400-ton training sloop
- Havfruen (Denmark): 407-ton H class submarine
- Havhesten (Denmark): 407-ton H class submarine
- Havkalen (Denmark): 407-ton H class submarine
- Havkatten (Denmark): 108-ton torpedo boat
- Havmanden (Denmark): 407-ton H class submarine
- Havørnen (Denmark): 108-ton torpedo boat and minesweeper
- Heimdal (Norway): 578-ton offshore patrol vessel
- Hejmdal (Denmark): 705-ton patrol boat, became Nerger (Germany)
- Henrik Gerner (Denmark): 463-ton submarine tender and minelayer
- Henrique Diaz (Brazil): 680-ton trawler
- Hitra (Norway): 125-ton submarine chaser
- Høgen (Denmark): 290-ton torpedo boat, became TFA1 (Germany)
- Hoi Fu (China): 680-ton gunboat
- Honningsvåg (Norway): 487-ton naval trawler
- Hsien Ning (China): 418-ton gunboat
- Hu Ngo (China): 97-ton torpedo boat, became Kawasemi (Japan)
- Hu Peng (China): 97-ton torpedo boat
- Hu Tsuin (China): 97-ton torpedo boat
- Hu Ying (China): 97-ton torpedo boat
- Hvalen (Denmark): 290-ton torpedo boat, became TFA5 (Germany)
- Hvalrossen (Denmark): 160-ton torpedo boat
Read more about this topic: List Of World War II Ships Of Less Than 1000 Tons