- Sabota Lark
- Saffron Toucanet
- Sage Thrasher
- Sahel Bush Sparrow
- Salvadori's Fig Parrot
- Sapphire-vented Puffleg
- Saw-billed Hermit
- Saxaul Sparrow
- Scale-throated Earthcreeper
- Scarlet-browed Tanager
- Scarlet Minivet
- Sclater's Nightingale-Thrush
- Scripps's Murrelet
- Sedge Wren
- Sepia-capped Flycatcher
- Serra do Mar Tyrant-Manakin
- Shaft-tailed Whydah
- Sharp-billed Treehunter
- Sharp-tailed Streamcreeper
- Shelley's Sparrow
- Short-bearded Melidectes
- Short-tailed Lark
- Shrike-like Tanager
- Shy Albatross
- Sierra Madre Sparrow
- Silver Gull
- Sinaloa Wren
- Singing Starling
- Sirkeer Malkoha
- Slaty-backed Gull
- Slaty Robin
- Slaty Vireo
- Slender-billed Finch
- Small Ground Finch
- Small Tree Finch
- Smoky Robin
- Snow Mountain Robin
- Somali Short-toed Lark
- Sombre Hummingbird
- Sombre Kingfisher
- Sombre Rock Chat
- Sooty-fronted Spinetail
- Sora
- Southern Antpipit
- Southern Black Flycatcher
- Southern Royal Albatross
- Spanish Sparrow
- Speckled Wood Pigeon
- Spice Imperial Pigeon
- Splendid Astrapia
- Spot-backed Antshrike
- Spot-breasted Antvireo
- Spot-winged Wood Quail
- Spotted Antbird
- Spotted Bamboowren
- Spotted Bush Warbler
- Spotted Ground Thrush
- Spotted Honeyeater
- Spotted Owl
- Spotted Wren
- Squamate Antbird
- Sri Lanka Scimitar Babbler
- Sri Lanka White-eye
- Sri Lanka Wood Pigeon
- Standardwing
- Steller's Sea Eagle
- Stephan's Emerald Dove
- Steppe Eagle
- Straight-billed Earthcreeper
- Streak-headed Honeyeater
- Streak-throated Barwing
- Streaked Shearwater
- Streaked Weaver
- Streaked Xenops
- Striated Babbler
- Strickland's Woodpecker
- Stripe-breasted Starthroat
- Stripe-throated Yuhina
- Striped Sparrow
- Subantarctic Snipe
- Sulawesi Scops Owl
- Sulphur-bellied Warbler
- Swamp Francolin
- Sword-billed Hummingbird