- Maasdam (1952)
- Maasdam (1993)
- Maestro (1966)
- Magellan (1985)
- Mages (1985)
- Magic I (1973)
- Maksim Gorkiy (1969)
- Manara (2017)
- Manistal (1974)
- Marco Polo (1965)
- Mare (1984)
- Marella Celebration (1984)
- Marella Explorer (1996)
- Marella Spirit (1983)
- Mare S (1983)
- Maria Savina (1975)
- Marieholm (1934)
- Marina (2011)
- Mariya Ermolova (1974)
- Maxim Gorkiy (1969)
- Maxim M (1969)
- Med Queen (1989)
- Mediterranea (2003)
- Megastar Aries (1991)
- Megastar Sagittarius (1991)
- Mein Schiff (1996)
- Mein Schiff 1 (1996)
- Mein Schiff 2 (1997)
- Mein Schiff 3 (2014)
- Mein Schiff 4 (2015)
- Mein Schiff 5 (2016)
- Mein Schiff 6 (2017)
- Mein Schiff 7 (2024)
- Mein Schiff 1 (2018)
- Mein Schiff 2 (2019)
- Mein Schiff Herz (1997)
- Mercury (1997)
- Mermoz (1957)
- Metropolis (1972)
- Meyer Turku 1401 (2025)
- Meyer Turku 1402 (2026)
- Midnatsol (1982)
- Midnatsol (2003)
- Midnatsol II (1982)
- Mikhail Lermontov (1986)
- Millenium (2000)
- Ming Fai Princess (1972)
- Minerva II (2001)
- Mira 1 (1989)
- Mirage (1973)
- Mirage 1 (1973)
- Mistral (1999)
- Mona Lisa (1966)
- Monarch (1991)
- Monarch of the Seas (1991)
- Monarch Star (1958)
- MSC Armonia (2001)
- MSC Fantasia (2008)
- MSC Grandiosa (2019)
- MSC Lirica (2003)
- MSC Magnifica (2010)
- MSC Meraviglia (2017)
- MSC Opera (2004)
- MSC Orchestra (2007)
- MSC Poesia (2008)
- MSC Preziosa (2013)
- MSC Seaview (2018)
- MSC Sinfonia (2002)
- MSC Virtuosa (2020)
- Myconos (1944)