- Saint Helena
- Salvages, islands, Ilhas Selvagens
- Saturniidae, Phalaena
- Sauerkraut
- Sava
- Scotland
- Scurvy
- Sea Breeze
- Sea Service Musket
- Seaman’s Chest
- Selk'nam
- Setting
- Ship Worm, Teredinidae
- Ship’s Carpenter
- Ship's Company, Endeavour
- Shipwright
- Shoals
- Sisarga, Isla Sisarga Grande
- Slops (seamen's clothing)
- Small Arms
- Small Bower Anchor
- Small Sails, Studding Sails
- Smith, Isaac (1752 - 1831), Seaman and naval captain
- Smuggling
- Snowy Sheathbill, Chionis alba
- Snuff
- Society Islands
- Solander, Daniel Carlsson (1733 - 1782), Botanist
- Sooty Shearwater, Puffinus griseus
- Sooty Tern, Sterna fuscata
- Sounding
- South American Fur Seal, Arctocephalus australis australis; Artocephalus australis gracilis
- South Foreland
- Southern Giant Petrel, Macronectes Giganteus
- Southern Right Whale, Eubalaena australis
- Southern Royal Albatross, Diomedea epomophora
- Squalls
- Standing
- Start Point
- Staten Island
- Sterna fuscata, Sooty Tern
- Stevens, Henry
- Stone Pier
- Stream Anchor
- Studding Sails, Small Sails
- Sulidae, Boobies
- Swivel Gun
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