- Saffron Finch
- Sand Martin
- Sanderling
- Sandhill Crane
- Savannah Sparrow
- Scarlet Ibis
- Scarlet Macaw
- Scarlet Tanager
- Scissor-tailed Flycatcher
- Semipalmated Plover
- Semipalmated Sandpiper
- Sharp-shinned Hawk
- Short-billed Dowitcher
- Short-eared Owl
- Snow Bunting
- Snow Goose
- Snowy Egret
- Snowy Owl
- Solitary Sandpiper
- Song Sparrow
- Sora
- Southern Rockhopper Penguin
- Spangled Cotinga
- Spotted Sandpiper
- Spruce Grouse
- Steller's Jay
- Summer Tanager
- Sun Parakeet
- Sunbittern
- Swainson's Hawk
- Swamp Sparrow
- Swan Goose