- Sabota Lark
- Saffron-crested Tyrant-Manakin
- Saffron-crowned Tanager
- Saffron Toucanet
- Sage Thrasher
- Sahel Bush Sparrow
- Sahel Paradise Whydah
- Sahul Cicadabird
- Salvadori's Antwren
- Salvadori's Fig Parrot
- Salvadori's Pheasant
- Salvin's Curassow
- San Blas Jay
- Sandstone Shrikethrush
- Sangkar White-eye
- Santa Marta Antbird
- Santa Marta Blossomcrown
- Santa Marta Brushfinch
- Santa Marta Screech Owl
- Santa Marta Woodstar
- Santarem Parakeet
- Sao Francisco Black Tyrant
- Sao Francisco Sparrow
- Sao Paulo Bristle Tyrant
- Sapphire-bellied Hummingbird
- Sapphire-spangled Emerald
- Sapphire-vented Puffleg
- Satanic Nightjar
- Satyr Tragopan
- Saunders's Gull
- Saw-billed Hermit
- Saxaul Sparrow
- Scale-crested Pygmy Tyrant
- Scale-throated Earthcreeper
- Scaled Antbird
- Scaled Dove
- Scaled Piculet
- Scaled Pigeon
- Scaled Woodcreeper
- Scalloped Woodcreeper
- Scaly-breasted Bulbul
- Scaly-breasted Cupwing
- Scaly-breasted Illadopsis
- Scaly-breasted Munia
- Scaly-throated Honeyguide
- Scaly Babbler
- Scaly Chatterer
- Scaly Ground Roller
- Scarce Swift
- Scarlet-and-white Tanager
- Scarlet-banded Barbet
- Scarlet-breasted Fruiteater
- Scarlet-browed Tanager
- Scarlet-crowned Barbet
- Scarlet-rumped Trogon
- Scarlet-throated Tanager
- Scarlet Finch
- Scarlet Minivet
- Schlegel's Asity
- Schneider's Pitta
- Schwartz's Antthrush
- Scimitar-billed Woodcreeper
- Scissor-tailed Kite
- Scissor-tailed Nightjar
- Screaming Cowbird
- Scripps's Murrelet
- Scrub Euphonia
- Senegal Eremomela
- Senegal Lapwing
- Sepia-capped Flycatcher
- Serendib Scops Owl
- Serra Antwren
- Serra do Mar Tyrant-Manakin
- Serra Finch
- Shaft-tailed Whydah
- Sharp-billed Treehunter
- Sharp-tailed Grass Tyrant
- Sharp-tailed Grouse
- Sharp-tailed Ibis
- Sharp-tailed Streamcreeper
- Sharpbill
- Sharpe's Akalat
- Sharpe's Drongo
- Sharpe's Longclaw
- Shelley's Francolin
- Shelley's Sparrow
- Shiny Whistling Thrush
- Short-bearded Honeyeater
- Short-billed Canastero
- Short-billed Honeycreeper
- Short-billed Leaftosser
- Short-billed Miner
- Short-billed Pipit
- Short-crested Coquette
- Short-crested Flycatcher
- Short-tailed Lark
- Short-tailed Swift
- Short-tailed Woodstar
- Short-toed Coucal
- Short-winged Cisticola
- Shrike-like Tanager
- Shy Albatross
- Siberian Blue Robin
- Siberian Jay
- Siberian Long-tailed Rosefinch
- Siberian Rubythroat
- Sickle-billed Vanga
- Sierra Madre Sparrow
- Sierra Nevada Brushfinch
- Sierran Elaenia
- Silver-eared Mesia
- Silver-rumped Spinetail
- Silver-throated Tanager
- Silver Gull
- Silvered Antbird
- Silvery-cheeked Antshrike
- Silvery-fronted Tapaculo
- Sinaloa Crow
- Sinaloa Wren
- Sincora Antwren
- Sind Sparrow
- Singing Bush Lark
- Singing Starling
- Sirkeer Malkoha
- Slate-colored Antbird
- Slate-colored Hawk
- Slate-throated Whitestart
- Slaty-backed Gull
- Slaty-backed Nightingale-Thrush
- Slaty-breasted Tinamou
- Slaty-capped Flycatcher
- Slaty-winged Foliage-gleaner
- Slaty Brushfinch
- Slaty Egret
- Slaty Robin
- Slaty Vireo
- Slender-billed Finch
- Slender-billed Flufftail
- Slender-billed Inezia
- Slender-billed Miner
- Slender-billed Oriole
- Slender-billed Parakeet
- Slender-billed Prion
- Slender-billed Starling
- Slender-billed Xenops
- Slender-footed Tyrannulet
- Slender-tailed Nightjar
- Slender Antbird
- Small-headed Elaenia
- Small Ground Finch
- Small Tree Finch
- Smoky Robin
- Snethlage's Tody-Tyrant
- Snow Goose
- Snow Mountain Robin
- Snow Petrel
- Snowy-browed Flycatcher
- Snowy-crowned Tern
- Snowy-throated Kingbird
- Snowy Sheathbill
- Sociable Weaver
- Socotra Cormorant
- Sokoke Scops Owl
- Solitary Eagle
- Somali Ostrich
- Somali Short-toed Lark
- Sombre Hummingbird
- Sombre Kingfisher
- Sombre Rock Chat
- Song Wren
- Sooty-capped Hermit
- Sooty-faced Finch
- Sooty-fronted Spinetail
- Sooty-headed Tyrannulet
- Sooty Ant Tanager
- Sooty Flycatcher
- Sora
- South Georgia Diving Petrel
- South Georgia Pipit
- South Georgia Shag
- Southern Antpipit
- Southern Banded Snake Eagle
- Southern Black Flycatcher
- Southern Bristle Tyrant
- Southern Chestnut-breasted Wren
- Southern Chestnut-tailed Antbird
- Southern Fulmar
- Southern Giant Petrel
- Southern Grey-headed Sparrow
- Southern Grosbeak-Canary
- Southern Hyliota
- Southern Long-tailed Woodcreeper
- Southern Mouse-colored Tyrannulet
- Southern Pied Babbler
- Southern Red-fronted Tinkerbird
- Southern Royal Albatross
- Southern White-fringed Antwren
- Spanish Sparrow
- Sparkling Violetear
- Speckle-breasted Woodpecker
- Speckle-chested Piculet
- Speckle-fronted Weaver
- Speckle-throated Woodpecker
- Speckled Nightingale-Thrush
- Speckled Piculet
- Speckled Tinkerbird
- Speckled Wood Pigeon
- Spectacled Bristle Tyrant
- Spectacled Bulbul
- Spectacled Guillemot
- Spectacled Parrotlet
- Spectacled Spiderhunter
- Spectacled Tyrannulet
- Spice Imperial Pigeon
- Spike-heeled Lark
- Spillmann's Tapaculo
- Spinifex Pigeon
- Spinifexbird
- Spix's Guan
- Splendid Astrapia
- Splendid Starling
- Spot-backed Antbird
- Spot-backed Antshrike
- Spot-backed Antwren
- Spot-breasted Antvireo
- Spot-breasted Oriole
- Spot-breasted Scimitar Babbler
- Spot-breasted Wren
- Spot-crowned Euphonia
- Spot-necked Babbler
- Spot-throated Hummingbird
- Spot-winged Antbird
- Spot-winged Pigeon
- Spot-winged Wood Quail
- Spotted Antbird
- Spotted Antpitta
- Spotted Bamboowren
- Spotted Bush Warbler
- Spotted Crocias
- Spotted Eagle-Owl
- Spotted Ground Thrush
- Spotted Honeyeater
- Spotted Honeyguide
- Spotted Laughingthrush
- Spotted Nothura
- Spotted Owl
- Spotted Piculet
- Spotted Rail
- Spotted Tody-Flycatcher
- Spotted Wren
- Squamate Antbird
- Square-tailed Nightjar
- Square-tailed Saw-wing
- Sri Lanka Scimitar Babbler
- Sri Lanka Spurfowl
- Sri Lanka White-eye
- Sri Lanka Wood Pigeon
- Standard-winged Nightjar
- Standardwing
- Star-chested Treerunner
- Steller's Sea Eagle
- Stephan's Emerald Dove
- Steppe Eagle
- Stierling's Woodpecker
- Stierling's Wren-Warbler
- Stiles's Tapaculo
- Storm's Stork
- Stout-billed Cinclodes
- Stout Cisticola
- Straight-billed Earthcreeper
- Straight-billed Woodcreeper
- Streak-backed Canastero
- Streak-backed Oriole
- Streak-breasted Scimitar Babbler
- Streak-capped Spinetail
- Streak-crowned Antvireo
- Streak-headed Antbird
- Streak-headed Honeyeater
- Streak-headed Woodcreeper
- Streak-throated Barwing
- Streak-throated Canastero
- Streak-throated Hermit
- Streaked Laughingthrush
- Streaked Shearwater
- Streaked Weaver
- Streaked Xenops
- Streaky Seedeater
- Striated Babbler
- Striated Bulbul
- Striated Caracara
- Striated Heron
- Striated Yuhina
- Strickland's Woodpecker
- Striolated Manakin
- Stripe-backed Bittern
- Stripe-backed Wren
- Stripe-breasted Starthroat
- Stripe-breasted Tit
- Stripe-breasted Wren
- Stripe-chested Antwren
- Stripe-necked Tody-Tyrant
- Stripe-tailed Hummingbird
- Stripe-tailed Yellow Finch
- Stripe-throated Hermit
- Stripe-throated Yuhina
- Striped Owl
- Striped Prinia
- Striped Sparrow
- Striped Woodcreeper
- Striped Woodpecker
- Striped Wren-Babbler
- Strong-billed Woodcreeper
- Stub-tailed Antbird
- Stub-tailed Spadebill
- Stuhlmann's Starling
- Styan's Bulbul
- Styan's Grasshopper Warbler
- Stygian Owl
- Subantarctic Snipe
- Subdesert Brush Warbler
- Subtropical Doradito
- Suiriri Flycatcher
- Sulawesi Babbler
- Sulawesi Bush Warbler
- Sulawesi Cicadabird
- Sulawesi Masked Owl
- Sulawesi Scops Owl
- Sulawesi Thrush
- Sulphur-bellied Flycatcher
- Sulphur-bellied Tyrant-Manakin
- Sulphur-bellied Warbler
- Sulphur-rumped Myiobius
- Sulphur-vented Whistler
- Sumatran Babbler
- Sumatran Bulbul
- Sumatran Ground Cuckoo
- Sumatran Shortwing
- Sumatran Trogon
- Sumatran Wren-Babbler
- Sumichrast's Wren
- Sun Lark
- Sunbittern
- Sunda Blue Flycatcher
- Sunda Brush Cuckoo
- Sunda Collared Dove
- Sunda Cuckoo
- Sunda Cuckooshrike
- Sunda Forktail
- Sunda Frogmouth
- Sunda Laughingthrush
- Sunda Minivet
- Sunda Pygmy Woodpecker
- Sunda Scimitar Babbler
- Sunda Scops Owl
- Superb Starling
- Superciliaried Hemispingus
- Superciliated Wren
- Swahili Sparrow
- Swainson's Flycatcher
- Swamp Boubou
- Swamp Flycatcher
- Swamp Francolin
- Swamp Nightjar
- Swinhoe's Pheasant
- Swinhoe's White-eye
- Sword-billed Hummingbird
- Swynnerton's Robin