- Saga Pearl II (1981)
- Saga Rose (1965)
- Saga Ruby (1973)
- Saga Sapphire (1981)
- Sagafjord (1965)
- Saint Laurent (2001)
- Saipan Star (1992)
- Salamis Filoxenia (1975)
- Sally Albatross (1980)
- Sally Caravelle (1990)
- Sally Clipper (1989)
- Sampaguida ferry 2 (1975)
- Santa Cruise (1969)
- Santa Rosa (1958)
- Sapphire Princess (2004)
- Saqqit Ittuk (1992)
- Sarpik Ittuk (1992)
- Satoshi (1991)
- Saudi-Filipinas 1 (1939)
- SaudiPhil 1 (1939)
- Scandinavian Saga (1974)
- Scandinavian Dawn (1968)
- Scandinavian Sky II (1968)
- Sea Adventurer (1975)
- Sea Diamond (1986)
- Sea Discoverer (2004)
- Sea Endurance (1992)
- Sea Explorer (1991)
- Sea Explorer I (1991)
- Sea Princess (1966)
- Sea Princess (1998)
- Sea Spirit (1991)
- Sea Venture (1971)
- Sea Voyager (2001)
- Seabourn Legend (1992)
- Seabourn Odyssey (2009)
- Seabourn Ovation (2018)
- Seabourn Pride (1988)
- Seabourn Quest (2011)
- Seabourn Sojourn (2010)
- Seabourn Spirit (1989)
- Seabourn Sun (1988)
- Seabreeze I (1958)
- Seaventure (1990)
- Seawind Crown (1961)
- Seawing (1971)
- Sensation (1993)
- Serena (1957)
- Serenade (1957)
- Serenade of the Seas (2003)
- Serenissima (1960)
- Seven Seas Explorer (2016)
- Seven Seas Mariner (2001)
- Seven Seas Navigator (1999)
- Seven Seas Splendor (2020)
- Seven Seas Voyager (2003)
- SH Diana (2023)
- SH Minerva (2021)
- SH Vega (2022)
- Shangri-la World (1969)
- Shalom (1964)
- Silja Opera (1980)
- Silver Cloud (1994)
- Silver Dawn (2021)
- Silver Discoverer (1989)
- Silver Explorer (1989)
- Silver Shadow (2000)
- Silver Spirit (2009)
- Silver Whisper (2001)
- Silver Wind (1995)
- Sirena (1999)
- Sitmar Fairmajesty (1989)
- Sitmar Fairwind (1957)
- Sky (1992)
- Sky Princess (1984)
- Sky Princess (2019)
- Sky Wonder (1984)
- Skysea Golden Era (1995)
- Skyward (1969)
- Sofia (1974)
- Song of America (1982)
- Song of Flower (1974)
- Song of Norway (1970)
- Shota Rustaveli (1968)
- Southern Cross (1955)
- Southward (1971)
- Sovereign (1987)
- Sovereign of the Seas (1987)
- Spirit (1983)
- Spirit of Adventure (1980)
- Spirit of Adventure (2020)
- Spirit of Discovery (2019)
- Spirit of Oceanus (1991)
- Spitsbergen (2009)
- SS Emerald (1958)
- St Tropez (1974)
- St. Victoria (1996)
- Star Breeze (1989)
- Star Legend (1992)
- Star Odyssey (1972)
- Star of the Seas (2025)
- Star Pisces (1990)
- Star Pride (1988)
- Star Princess (1989)
- Star Princess (2002)
- Starship Oceanic (1965)
- Starship Royale (1958)
- Starligth Express (1955)
- Starry Metropolis (1976)
- Starward (1968)
- Statendam (1993)
- Stefan (1952)
- Stefan Batory (1952)
- Stena Arcadia (1974)
- Stockholm (1948)
- Summit (2001)
- Sun (1964)
- Sun (1991)
- Sun Princess (1995)
- Sun Viking (1972)
- Sun Viva (1991)
- Sunbird (1982)
- Sundancer (1975)
- Sundream (1970)
- Sunward (1973)
- Superstar Aquarius (1993)
- Superstar Aries (1981)
- Superstar Capricorn (1973)
- Superstar Europe (1981)
- Superstar Gemini (1992)
- Superstar Gemini (1992) Dreamward
- Superstar Leo (1998)
- Superstar Sagittarius (1972)
- Superstar Taurus (1980)
- Superstar Virgo (1999)
- Sylvania (1957)
- Sylvia Earle (2022)