- Sabota Lark
- Saddle-billed Stork
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Scaly-throated Foliage-gleaner
- Scarlet Macaw
- Scheepmaker's Crowned Pigeon
- Semipalmated Plover
- Short-toed Snake Eagle
- Silver-throated Tanager
- Silver Gull
- Slaty-tailed Trogon
- Snowy Egret
- Southern Grey-headed Sparrow
- Southern Ground Hornbill
- Southern Pochard
- Southern Red-billed Hornbill
- Southern Yellow-billed Hornbill
- Speckled Chachalaca
- Spotted Redshank
- Squacco Heron
- Squirrel Cuckoo
- Streaky-headed Seedeater
- Striped Treehunter
- Sunbittern