- Saddle-billed Stork
- Saffron Finch
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Savanna Hawk
- Sayaca Tanager
- Scaly-headed Parrot
- Scarlet-chested Sunbird
- Scarlet-faced Liocichla
- Scarlet-headed Blackbird
- Scarlet Flycatcher
- Secretarybird
- Senegal Coucal
- Serendib Scops Owl
- Seychelles Black Parrot
- Seychelles Blue Pigeon
- Seychelles Fody
- Seychelles Magpie-Robin
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Seychelles Warbler
- Shelley's Sparrow
- Shikra
- Shiny Cowbird
- Shoebill
- Short-toed Treecreeper
- Silver-beaked Tanager
- Silver-breasted Broadbill
- Silver-eared Laughingthrush
- Silver Pheasant
- Silvery-cheeked Hornbill
- Sirkeer Malkoha
- Slate-colored Boubou
- Slender-billed Gull
- Slender-tailed Nightjar
- Small Minivet
- Smooth-billed Ani
- Snail Kite
- Snowy Egret
- Solitary Cacique
- Solitary Sandpiper
- Somali Bunting
- Somali Courser
- Somali Fiscal
- Somali Short-toed Lark
- Song Thrush
- Sooty Tern
- South American Tern
- Southern Giant Petrel
- Southern Lapwing
- Southern Martin
- Southern Mouse-colored Tyrannulet
- Southern Red Bishop
- Southern Rough-winged Swallow
- Southern Screamer
- Spanish Imperial Eagle
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Tyrant
- Speke's Weaver
- Spoon-billed Sandpiper
- Spot-billed Pelican
- Spot-breasted Lapwing
- Spot-winged Thrush
- Spotless Starling
- Spotted Dove
- Spotted Flycatcher
- Spotted Owlet
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Bulbul
- Squirrel Cuckoo
- Sri Lanka Drongo
- Sri Lanka Frogmouth
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Hanging Parrot
- Sri Lanka Hill Myna
- Sri Lanka Junglefowl
- Sri Lanka Scimitar Babbler
- Sri Lanka Spurfowl
- Sri Lanka White-eye
- Sri Lanka Woodshrike
- Steel-blue Whydah
- Stork-billed Kingfisher
- Straight-billed Woodcreeper
- Straw-tailed Whydah
- Streaked Flycatcher
- Streaky Seedeater
- Stresemann's Bushcrow
- Striated Heron
- Striped Kingfisher
- Sunbittern
- Sungrebe
- Superb Starling
- Surucua Trogon
- Swainson's Flycatcher
- Swainson's Sparrow
- Swallow-winged Puffbird
- Swallow Tanager
- Swamp Flycatcher