- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Savannah Sparrow
- Sedge Warbler
- Sharp-shinned Hawk
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Stonechat
- Slender-billed Gull
- Snow Bunting
- Song Sparrow
- Song Thrush
- Sooty Shearwater
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Squacco Heron
- Swamp Sparrow
- Swan Goose