S
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- 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
-
- Stinging Eel Catfish
- Plotosus lineatus
-
- Swell Shark
- Cephaloscyllium ventriosum
-
- Threespine Stickleback
- Gasterosteus aculeatus
-
- Unarmored Threespine Stickleback
- Gasterosteus aculeatus williamsoni
-
- Weedy Scorpionfish
- Rhinopias frondosa
-
- Weedy Seadragon
- Phyllopteryx taeniolatus
-
- West Coast Sea Nettle
- Chrysaora fuscescens
-
- Whale Shark
- Rhincodon typus
-
- Whitetip Reef Shark
- Triaenadon obesus
-
- Zebra Shark
- Stegastoma fasciatum
