-
- Saltwort
- Batis maritima
-
- Salty Susan
- Jaumea carnosa
-
- Sand Tiger Shark
- Carcharias taurus
-
- Sarcastic Fringehead
- Neoclinus blanchardi
-
- Sea Lavender
- Limonium californicum
-
- Shiner Surfperch
- Cymatogaster aggregata
-
- Silver Surfperch
- Hyperprosopon ellipticum
-
- Snowy Egret
- Egretta thula
-
- Southern Pacific Rattlesnake
- Crotalus oreganus helleri
-
- Southern Sea Otter
- Enhydra lutris neres
-
- Sperm Whale
- Physeter macrocephalus
-
- Spiny Rush
- Juncus acutus leopoldii
-
- Spot Prawn
- Pandalus platyceros
-
- Spotted Ratfish
- Hydrolagus colliei
-
- Squat Lobster
- Munidopsis spp.
-
- Stinging Eel Catfish
- Plotosus lineatus
-
- Swell Shark
- Cephaloscyllium ventriosum
-
- Threespine Stickleback
- Gasterosteus aculeatus
-
- Unarmored Threespine Stickleback
- Gasterosteus aculeatus williamsoni
-
- Vampire Squid
- Vampyroteuthis infernalis
