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- Saint-Barthélemy Channel - between Saint Barthélemy and Saint Martin
- St George's Channel - between Ireland and Wales
- St George's Channel - between New Britain and New Ireland in the Bismarck Archipelago
- Saint Lucia Channel - between Martinique and Saint Lucia
- Saint Vincent Passage - between Saint Vincent and Saint Lucia
- Sakonnet River - between Aquidneck Island and Tiverton and Little Compton, Rhode Island.
- San Bernardino Strait - between Luzon and Samar in the Philippines
- San Juanico Strait - between Samar and Leyte islands in the Philippines
- Scapa Flow - between several of the Orkney islands
- Serpent's Mouth (Boca del Serpiente) - between Trinidad and Venezuela
- Shelikof Strait - between mainland Alaska and Kodiak Island
- Sibutu Passage - between Borneo and the Sulu Archipelago
- Singapore Strait - between Singapore and Indonesia (Sumatra)
- Skagerrak separating Denmark from Norway and Sweden
- Smith Sound - between Ellesmere Island and Greenland
- Strait of Baltiysk - between Vistula Bay and Gdansk Bay
- Strait of Belle Isle - between Newfoundland and mainland Canada
- Strait of Bonifacio - between Corsica and Sardinia
- Strait of Canso - between Cape Breton Island and mainland Nova Scotia
- Strait of Dover - the narrowest part of the English Channel between Great Britain and France
- Strait of Georgia - between Vancouver Island and mainland British Columbia, Canada
- Strait of Gibraltar - between Europe and Africa
- Strait of Hormuz - between Oman and Iran
- Strait of Juan de Fuca - between Vancouver Island, Canada and Olympic Peninsula, United States
- Strait of Magellan - between South America and Tierra del Fuego
- Strait of Malacca - between Peninsular Malaysia and Sumatra
- Strait of Messina - between Sicily and mainland Italy
- Strait of Otranto - between Italy and Albania
- Strait of Sicily - between Sicily and Africa
- Strait of Tartary (also Mamiya Strait and Strait of Nevelskoi) - Sakhalin
- Strait of Tebrau - between Peninsular Malaysia and Singapore
- Strait of Tiran - between the Sinai peninsula and Saudi Arabia
- Straits of Corfu - between the Greek island Corfu and mainland Greece/Albania
- Straits of Florida - between Florida and Cuba
- Straits of Mackinac - between Michigan's Upper and Lower Peninsulas
- Straits of Niagara - between Lake Erie and the Lake Ontario / and the Province of Ontario, Canada, and the State of New York, USA
- The Solent - between the Isle of Wight and the mainland of southern England
- South Kvarken - between the Finnish Åland Islands and Sweden
- Soya Strait or La Pérouse Strait is a strait dividing Sakhalin (Karafuto) from Hokkaidō
- Sumba Strait - between Flores and Sumba, Indonesia
- Sunda Strait - between Sumatra and Java
- Surigao Strait - between Leyte and Mindanao islands in the Philippines
- Svinesund - between Norway and Sweden
- The Swale - between the Isle of Sheppey and the mainland of southern England
Read more about this topic: List Of Straits