W
- Wakakura (New Zealand): 540-ton Castle class naval trawler
- Warendorp (Germany): 109-ton training vessel, ex-Reiher
- Wei Sheng (China): 932-ton gunboat, scuttled in 1937
- West Diep (Belgium): 109-ton torpedo boat, became Reiher (Germany)
- Wielingen (Belgium): 227-ton torpedo boat
- Wilk (Poland) 980-ton submarine
- Wu Feng (China): 200-ton gunboat
Read more about this topic: List Of World War II Ships Of Less Than 1000 Tons