- Kahleberg (1983)
- Kaita (1993)
- Kalle (1964)
- Kalle III (1974)
- Kalliste (1993)
- Kalmarsund III (1932)
- Kalypso (1990)
- Kapella (1967)
- Kapella (1974)
- Kaptain Boris (1966)
- Kaptan Burhanettin Isim (1990)
- Kareliya (1976)
- KatExpress 1 (2009)
- KatExpress 2 (2013)
- Kattegat (1972)
- Kattegat (1996)
- Kaunas (1989)
- Kaunas Seaways (1989)
- Kazakhstan (1976)
- Kelibia (1964)
- Kerry (2001)
- Khalid 1 (1970)
- Kihnu Virve (2015)
- HMS Kilchernan (1943)
- King of Scandinavia (1974)
- King of Scandinavia (1975)
- King of Scandinavia (1987)
- King Orry (1975)
- King Seaways (1987)
- Kingdom (1977)
- Kivimo (1994)
- Knipan (1985)
- Koegelwieck (1992)
- Koguva (1979)
- Kong Harald (1993)
- Kongshavn (1979)
- Koningin Breatrix (1986)
- Konstantin Chernenko (1986)
- Konstantin Simonov (1982)
- Kopernik (1977)
- Korsholm III (1931)
- Kristina Brahe (1943)
- Kronprincessan Victoria (1981)
- Kronprins Carl Gustaf (1966)
- Kronprins Frederik (1981)
- Kronprins Harald (1976)
- Kronprins Harald (1987)
- Kumlinge (1970)
- Kvarve (1963)
- Kyholm (1998)
- Kypros Star (1966)
- Kökar (1967)
- Kõrgelaid (1987)