S
- Sand Tiger Shark
- Carcharias taurus
- Sandbar Shark
- Carcharhinus plumbeus
- 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
- Sperm Whale
- Physeter macrocephalus
- Spiny Rush
- Juncus acutus leopoldii
- Stinging Eel Catfish
- Plotosus lineatus
- Swell Shark
- Cephaloscyllium ventriosum
- Threespine Stickleback
- Gasterosteus aculeatus 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
- White Seabass
- Atractoscion< nobilis
- Whitetip Reef Shark
- Triaenadon obesus
- Zebra Shark
- Stegastoma fasciatum
