- Kalmarin (1971)
- Kanholmen (1963)
- Karolin (2000)
- Kata (2019)
- Katharina (1965)
- Kerttu (1905)
- Kieler Sprotte (1905)
- King (1983)
- Klavdiya Yelanskaya (1977)
- Koegelwieck (1992)
- Koi (1980)
- Kolovare (2019)
- Kommendant (1975)
- Kong Haakon (1906)
- Kong Olav (1964)
- Kongen (2009)
- Korkeasaari-Högholmen (1949)
- Korsholm (1931)
- Koski (1898)
- Krut (1956)
- Kung Ring (1902)
- Kungsö (1986)
- Kungsörnen (1965)
- Kuopio (1899)
- Kurisches Haff (1928)
- Kvinnherad (1950)
- Küselwind (1979)
- Kökar (1967)