- Saker Falcon
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Savannah Sparrow
- Savi's Warbler
- Scopoli's Shearwater
- Sedge Warbler
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Slender-billed Gull
- Smew
- Snow Bunting
- Snow Goose
- Song Sparrow
- Song Thrush
- Spanish Imperial Eagle
- Spanish Sparrow
- Spectacled Warbler
- Spotless Starling
- Spotted Flycatcher
- Squacco Heron
- Swainson's Thrush