- Saddle-billed Stork
- Sakalava Weaver
- Saker Falcon
- Sand Lark
- Sand Martin
- Sapphire-throated Hummingbird
- Sardinian Warbler
- Sarus Crane
- Savanna Hawk
- Savanna Nightjar
- Sayaca Tanager
- Scaled Dove
- Scaly-breasted Hummingbird
- Scaly-breasted Munia
- Scaly-headed Parrot
- Scarlet-chested Sunbird
- Scarlet-headed Blackbird
- Scarlet-rumped Cacique
- Scarlet-rumped Tanager
- Scarlet Flycatcher
- Scarlet Minivet
- Scintillant Hummingbird
- Senegal Coucal
- Shaft-tailed Whydah
- Shikra
- Shining Honeycreeper
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Jay
- Silver-beaked Tanager
- Slaty-tailed Trogon
- Slaty Antwren
- Slaty Flowerpiercer
- Small Minivet
- Smooth-billed Ani
- Snail Kite
- Snowy-bellied Hummingbird
- Snowy Egret
- Song Sparrow
- Song Thrush
- Song Wren
- Souimanga Sunbird
- Southern Beardless Tyrannulet
- Southern Bentbill
- Southern Carmine Bee-eater
- Southern Ground Hornbill
- Southern Lapwing
- Southern Mouse-colored Tyrannulet
- Southern Pied Babbler
- Southern Screamer
- Southern Yellow-billed Hornbill
- Speckle-throated Woodpecker
- Spectacled Owl
- Spectacled Tetraka
- Spot-breasted Woodpecker
- Spot-crowned Antvireo
- Spot-crowned Barbet
- Spotted Antbird
- Spotted Crake
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Nutcracker
- Spotted Owlet
- Spotted Woodcreeper
- Squacco Heron
- Square-tailed Bulbul
- Squirrel Cuckoo
- Sri Lanka Drongo
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Hanging Parrot
- Sri Lanka White-eye
- Sri Lanka Wood Pigeon
- Steller's Eider
- Steppe Eagle
- Stork-billed Kingfisher
- Straight-billed Woodcreeper
- Streak-chested Antpitta
- Streak-headed Woodcreeper
- Streak-throated Woodpecker
- Streaked Flycatcher
- Streaked Saltator
- Striated Heron
- Striated Laughingthrush
- Stripe-cheeked Woodpecker
- Stripe-tailed Hummingbird
- Stripe-throated Hermit
- Stripe-throated Jery
- Striped Cuckoo
- Striped Kingfisher
- Subdesert Mesite
- Sunbittern
- Superb Starling
- Swainson's Spurfowl
- Swallow-tailed Kite
- Swallow Tanager
- Swan Goose