- Saffron Finch
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Scarlet Ibis
- Scrub Blackbird
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Stonechat
- Silver Teal
- Slender-billed Gull
- Snowy Egret
- Song Thrush
- Southern Beardless Tyrannulet
- Southern House Wren
- Southern Lapwing
- Southern Screamer
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Squacco Heron
- Striated Heron
- Sunbittern
- Swan Goose