- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Sargasso Shearwater
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scaly-naped Pigeon
- Scarlet Tanager
- Scopoli's Shearwater
- Semipalmated Plover
- Semipalmated Sandpiper
- Shiny Cowbird
- Short-billed Dowitcher
- Short-toed Snake Eagle
- Slender-billed Gull
- Smooth-billed Ani
- Snail Kite
- Snow Goose
- Snowy Egret
- Solitary Sandpiper
- Song Thrush
- Sooty Tern
- Sora
- Spectacled Thrush
- Spectacled Warbler
- Spotted Flycatcher
- Spotted Sandpiper
- Squacco Heron
- Stilt Sandpiper