- Sabota Lark
- Sacred Kingfisher
- Saddle-billed Stork
- Saffron-billed Sparrow
- Saffron-crowned Tanager
- Saffron Finch
- Saffron Toucanet
- Sahel Bush Sparrow
- Sahel Paradise Whydah
- Sakalava Weaver
- Salvadori's Fig Parrot
- Salvadori's Teal
- Sand Lark
- Sand Martin
- Sanderling
- Sandstone Shrikethrush
- Sandwich Tern
- Sao Tome Fiscal
- Sao Tome Green Pigeon
- Sao Tome Ibis
- Sao Tome Olive Pigeon
- Sao Tome Oriole
- Sao Tome Paradise Flycatcher
- Sao Tome Prinia
- Sao Tome Scops Owl
- Sao Tome Shorttail
- Sao Tome Spinetail
- Sao Tome Thrush
- Sao Tome Weaver
- Sao Tome White-eye
- Sapphire-spangled Emerald
- Sapphire-vented Puffleg
- Sardinian Warbler
- Sarus Crane
- Satanic Nightjar
- Satin Bowerbird
- Savanna Hawk
- Savanna Nightjar
- Saw-billed Hermit
- Sayaca Tanager
- Scale-crested Pygmy Tyrant
- Scale-throated Hermit
- Scaled Antbird
- Scaled Dove
- Scaled Fruiteater
- Scaled Pigeon
- Scaled Woodcreeper
- Scaly-breasted Bulbul
- Scaly-breasted Cupwing
- Scaly-breasted Hummingbird
- Scaly-breasted Kingfisher
- Scaly-breasted Munia
- Scaly-crowned Babbler
- Scaly-crowned Honeyeater
- Scaly-feathered Weaver
- Scaly-throated Foliage-gleaner
- Scaly Ground Roller
- Scaly Laughingthrush
- Scaly Spurfowl
- Scaly Thrush
- Scarlet-backed Flowerpecker
- Scarlet-backed Woodpecker
- Scarlet-breasted Flowerpecker
- Scarlet-breasted Fruit Dove
- Scarlet-chested Sunbird
- Scarlet-headed Blackbird
- Scarlet-rumped Cacique
- Scarlet-rumped Tanager
- Scarlet-rumped Trogon
- Scarlet-thighed Dacnis
- Scarlet Finch
- Scarlet Ibis
- Scarlet Macaw
- Scarlet Minivet
- Scarlet Myzomela
- Scarlet Robin
- Schlegel's Asity
- Scintillant Hummingbird
- Scissor-tailed Flycatcher
- Sclater's Wren
- Scrub Blackbird
- Scrub Euphonia
- Scrub Honeyeater
- Scrubtit
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Batis
- Senegal Coucal
- Senegal Eremomela
- Senegal Lapwing
- Senegal Parrot
- Senegal Thick-knee
- Sepia-capped Flycatcher
- Serra do Mar Tyrannulet
- Sharp-billed Treehunter
- Sharp-tailed Sandpiper
- Sharp-tailed Starling
- Sharp-tailed Streamcreeper
- Sharpbill
- Sharpe's Apalis
- Shelley's Francolin
- Shelley's Sparrow
- Shelley's Starling
- Shikra
- Shining Bronze Cuckoo
- Shining Drongo
- Shining Flycatcher
- Shining Honeycreeper
- Shining Sunbeam
- Shining Sunbird
- Shiny Cowbird
- Shoebill
- Short-bearded Honeyeater
- Short-billed Dowitcher
- Short-billed Minivet
- Short-billed Pigeon
- Short-crested Flycatcher
- Short-eared Owl
- Short-legged Ground Roller
- Short-tailed Babbler
- Short-tailed Grasswren
- Short-tailed Hawk
- Short-tailed Lark
- Short-tailed Starling
- Short-toed Rock Thrush
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Short-winged Cisticola
- Siberian Blue Robin
- Siberian Jay
- Siberian Stonechat
- Sickle-billed Vanga
- Sickle-winged Guan
- Sierran Elaenia
- Sikkim Treecreeper
- Sikkim Wedge-billed Babbler
- Silver-backed Tanager
- Silver-beaked Tanager
- Silver-breasted Broadbill
- Silver-crowned Friarbird
- Silver-throated Tanager
- Silver-tipped Imperial Pigeon
- Silver Gull
- Silvereye
- Silvery-cheeked Hornbill
- Silvery-flanked Antwren
- Silvery Grebe
- Simple Greenbul
- Singing Bush Lark
- Singing Cisticola
- Singing Honeyeater
- Slate-colored Boubou
- Slate-colored Grosbeak
- Slate-colored Solitaire
- Slate-throated Whitestart
- Slaty-backed Forktail
- Slaty-backed Nightingale-Thrush
- Slaty-bellied Tesia
- Slaty-blue Flycatcher
- Slaty-headed Tody-Flycatcher
- Slaty-tailed Trogon
- Slaty Antwren
- Slaty Bristlefront
- Slaty Flowerpiercer
- Slaty Robin
- Slaty Vireo
- Slender-billed Crow
- Slender-billed Greenbul
- Slender-billed Gull
- Slender-billed Scimitar Babbler
- Slender-billed Vulture
- Slender-billed Weaver
- Slender-tailed Nightjar
- Small-headed Elaenia
- Small Ground Finch
- Small Minivet
- Small Niltava
- Small Pratincole
- Smew
- Smoke-colored Pewee
- Smoky-brown Woodpecker
- Smoky Warbler
- Smooth-billed Ani
- Snail Kite
- Snow Mountain Quail
- Snow Petrel
- Snowy-bellied Hummingbird
- Snowy-browed Flycatcher
- Snowy-crowned Robin-Chat
- Snowy-throated Kingbird
- Snowy Cotinga
- Snowy Egret
- Snowy Sheathbill
- Social Flycatcher
- Sokoke Pipit
- Sokoke Scops Owl
- Solitary Cacique
- Somali Bee-eater
- Somali Bulbul
- Somali Bunting
- Somali Courser
- Somali Crow
- Somali Fiscal
- Somali Ostrich
- Somali Sparrow
- Sombre Greenbul
- Sombre Kingfisher
- Sombre Tit
- Song Thrush
- Sooretama Slaty Antshrike
- Sooty-capped Bush Tanager
- Sooty-crowned Flycatcher
- Sooty-faced Finch
- Sooty-headed Bulbul
- Sooty Barbet
- Sooty Chat
- Sooty Falcon
- Sooty Flycatcher
- Sooty Honeyeater
- Sooty Oystercatcher
- Sooty Tern
- Sooty Thrush
- Souimanga Sunbird
- South Georgia Pipit
- South Georgia Shag
- South Polar Skua
- Southern Antpipit
- Southern Beardless Tyrannulet
- Southern Black Flycatcher
- Southern Brown-throated Weaver
- Southern Cassowary
- Southern Crested Caracara
- Southern Emu-wren
- Southern Fiscal
- Southern Fulmar
- Southern Giant Petrel
- Southern Grey-headed Sparrow
- Southern Ground Hornbill
- Southern Hill Myna
- Southern Hyliota
- Southern Lapwing
- Southern Masked Weaver
- Southern Nightingale-Wren
- Southern Pied Babbler
- Southern Pochard
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Rockhopper Penguin
- Southern Rough-winged Swallow
- Southern Royal Albatross
- Southern Screamer
- Southern Scrub Robin
- Southern White-crowned Shrike
- Southern White-faced Owl
- Southern Whiteface
- Southern Yellow-billed Hornbill
- Southern Yellowthroat
- Spangle-cheeked Tanager
- Spangled Drongo
- Spanish Sparrow
- Sparkling Violetear
- Speckle-fronted Weaver
- Speckle-throated Woodpecker
- Speckled Boobook
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Piculet
- Speckled Pigeon
- Speckled Tanager
- Speckled Tinkerbird
- Spectacled Bulbul
- Spectacled Imperial Pigeon
- Spectacled Monarch
- Spectacled Owl
- Spectacled Spiderhunter
- Spectacled Tetraka
- Spectacled Thrush
- Spectacled Tyrant
- Spectacled Weaver
- Spectacled Whitestart
- Spice Imperial Pigeon
- Spinifex Pigeon
- Spinifexbird
- Spiny-cheeked Honeyeater
- Spix's Spinetail
- Splendid Astrapia
- Splendid Fairywren
- Splendid Starling
- Splendid Sunbird
- Spot-billed Pelican
- Spot-billed Toucanet
- Spot-breasted Antvireo
- Spot-breasted Heleia
- Spot-breasted Lapwing
- Spot-breasted Oriole
- Spot-breasted Scimitar Babbler
- Spot-breasted Wren
- Spot-flanked Barbet
- Spot-throated Hummingbird
- Spot-winged Grosbeak
- Spotted Antbird
- Spotted Barbtail
- Spotted Bowerbird
- Spotted Catbird
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Fantail
- Spotted Flycatcher
- Spotted Forktail
- Spotted Greenbul
- Spotted Ground Thrush
- Spotted Harrier
- Spotted Honeyguide
- Spotted Kestrel
- Spotted Laughingthrush
- Spotted Nutcracker
- Spotted Owlet
- Spotted Palm Thrush
- Spotted Pardalote
- Spotted Redshank
- Spotted Sandpiper
- Spotted Thick-knee
- Spotted Tody-Flycatcher
- Spotted Towhee
- Spotted Whistling Duck
- Spotted Wood Owl
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Bulbul
- Square-tailed Drongo-Cuckoo
- Square-tailed Kite
- Square-tailed Nightjar
- Squatter Pigeon
- Squirrel Cuckoo
- Sri Lanka Bay Owl
- Sri Lanka Frogmouth
- Standard-winged Nightjar
- Standardwing
- Star-throated Antwren
- Stark's Lark
- Steel-blue Whydah
- Steller's Jay
- Stephan's Emerald Dove
- Steppe Eagle
- Stierling's Wren-Warbler
- Stilt Sandpiper
- Stock Dove
- Stone Partridge
- Stork-billed Kingfisher
- Storm's Stork
- Stout-billed Cinclodes
- Stout Cisticola
- Straight-billed Woodcreeper
- Straw-necked Ibis
- Straw-tailed Whydah
- Streak-backed Oriole
- Streak-breasted Honeyeater
- Streak-breasted Woodpecker
- Streak-capped Antwren
- Streak-chested Antpitta
- Streak-eared Bulbul
- Streak-headed White-eye
- Streak-headed Woodcreeper
- Streak-throated Barwing
- Streak-throated Canastero
- Streak-throated Woodpecker
- Streaked Bulbul
- Streaked Flycatcher
- Streaked Laughingthrush
- Streaked Saltator
- Streaked Spiderhunter
- Streaked Xenops
- Streaky-headed Seedeater
- Streaky Seedeater
- Streamer-tailed Tyrant
- Stresemann's Bushcrow
- Striated Babbler
- Striated Bulbul
- Striated Caracara
- Striated Fieldwren
- Striated Grassbird
- Striated Heron
- Striated Laughingthrush
- Striated Pardalote
- Striated Swallow
- Striated Yuhina
- Striolated Bunting
- Stripe-breasted Wren
- Stripe-cheeked Greenbul
- Stripe-faced Greenbul
- Stripe-headed Antpitta
- Stripe-headed Sparrow
- Stripe-throated Bulbul
- Stripe-throated Hermit
- Stripe-throated Jery
- Stripe-throated Yuhina
- Striped Cuckoo
- Striped Honeyeater
- Striped Kingfisher
- Striped Laughingthrush
- Striped Pipit
- Strong-billed Honeyeater
- Strong-billed Woodcreeper
- Stubble Quail
- Subalpine Warbler
- Subdesert Brush Warbler
- Subdesert Mesite
- Subtropical Cacique
- Sudan Golden Sparrow
- Sulawesi Blue Flycatcher
- Sulawesi Cicadabird
- Sulawesi Drongo
- Sulawesi Dwarf Kingfisher
- Sulawesi Fantail
- Sulawesi Goshawk
- Sulawesi Hawk-Eagle
- Sulawesi Hornbill
- Sulawesi Leaf Warbler
- Sulawesi Myna
- Sulawesi Myzomela
- Sulawesi Pitta
- Sulawesi Pygmy Woodpecker
- Sulawesi Scops Owl
- Sulawesi Serpent Eagle
- Sulphur-bellied Flycatcher
- Sulphur-bellied Warbler
- Sulphur-crested Cockatoo
- Sulphur-rumped Myiobius
- Sulphur-vented Whistler
- Sultan's Cuckoo-Dove
- Sultan Tit
- Sumba Brown Flycatcher
- Sumba Flycatcher
- Sumba Green Pigeon
- Sumba Hornbill
- Sumba Myzomela
- Summer Tanager
- Sun Lark
- Sunbittern
- Sunda Pygmy Woodpecker
- Sunda Teal
- Sungrebe
- Superb Fairywren
- Superb Fruit Dove
- Superb Parrot
- Superb Starling
- Superb Sunbird
- Superciliated Wren
- Surfbird
- Surucua Trogon
- Swainson's Sparrow
- Swainson's Spurfowl
- Swainson's Thrush
- Swallow-tailed Bee-eater
- Swallow-tailed Gull
- Swallow-tailed Hummingbird
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swamp Boubou
- Swamp Flycatcher
- Swamp Harrier
- Swamp Palm Bulbul
- Sword-billed Hummingbird
- Swynnerton's Robin