- Saddle-billed Stork
- Saffron Finch
- Sand Martin
- Savanna Hawk
- Secretarybird
- Sedge Warbler
- Shikra
- Shoebill
- Siberian Stonechat
- Silverbird
- Silvery-cheeked Hornbill
- Slate-colored Boubou
- Slaty Egret
- Snow Bunting
- Snowy Albatross
- Snowy Egret
- Snowy Sheathbill
- Solitary Sandpiper
- South Georgia Pipit
- South Georgia Shag
- South Polar Skua
- Southern Carmine Bee-eater
- Southern Giant Petrel
- Southern Ground Hornbill
- Southern Lapwing
- Southern Rockhopper Penguin
- Southern Rough-winged Swallow
- Southern Screamer
- Speckle-fronted Weaver
- Speke's Weaver
- Spot-billed Pelican
- Spotted Dove
- Spotted Owlet
- Spotted Palm Thrush
- Spotted Thick-knee
- Spur-winged Goose
- Stock Dove
- Stork-billed Kingfisher
- Striated Caracara
- Striated Heron
- Strong-billed Woodcreeper
- Superb Starling