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- Panay (USA): 474-ton river gunboat, sunk 12 December 1937
- Paraguacu (Brazil): 430-ton river monitor
- Parnaiba (Brazil): 620-ton river monitor
- Paukku (Finland): 60-ton minelayer
- Pernambuco (Brazil): 470-ton river monitor
- Pichincha (Colombia): 120-ton coast guard vessel, class of 3
- Pikker (Estonia): 500-ton yacht, became Kiev (USSR) and later Luga (USSR)
- Pol III (Norway): 214-ton guard vessel
- Pommi (Finland): 80-ton mine tender
- Porkala (Finland): 162-ton minesweeper
- Pukkio (Finland): 162-ton minesweeper
Read more about this topic: List Of World War II Ships Of Less Than 1000 Tons