- Sabota Lark
- Saddle-billed Stork
- Saffron Finch
- Sakalava Weaver
- Sand Martin
- Sanderling
- Sandwich Tern
- Santa Marta Antbird
- Santa Marta Antpitta
- Santa Marta Brushfinch
- Santa Marta Foliage-gleaner
- Santa Marta Mountain Tanager
- Santa Marta Parakeet
- Santa Marta Warbler
- Santa Marta Woodstar
- Sapphire-vented Puffleg
- Sardinian Warbler
- Saunders's Tern
- Savannah Sparrow
- Say's Phoebe
- Scaled Dove
- Scaly-breasted Illadopsis
- Scaly-breasted Munia
- Scaly-feathered Weaver
- Scaly Chatterer
- Scaly Spurfowl
- Scarlet-backed Flowerpecker
- Scarlet-bellied Mountain Tanager
- Scarlet-chested Sunbird
- Scarlet-fronted Parakeet
- Scarlet-rumped Tanager
- Scarlet-rumped Tanager (costaricensis)
- Scarlet Macaw
- Scintillant Hummingbird
- Scissor-tailed Flycatcher
- Scrub Euphonia
- Scrub Tanager
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Senegal Coucal
- Senegal Lapwing
- Senegal Parrot
- Senegal Thick-knee
- Serendib Scops Owl
- Seychelles Black Parrot
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Kestrel
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Seychelles Swiftlet
- Shaft-tailed Whydah
- Shikra
- Shining-blue Kingfisher
- Shining Sunbeam
- Shiny Cowbird
- Shoebill
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-toed Rock Thrush
- Short-toed Treecreeper
- Short-winged Cisticola
- Siamese Pied Myna
- Siberian Blue Robin
- Sickle-billed Vanga
- Sickle-winged Guan
- Sierra Nevada Antpitta
- Sierra Nevada Brushfinch
- Silver-beaked Tanager
- Silver-throated Tanager
- Silverbird
- Silvery-cheeked Hornbill
- Silvery Grebe
- Singing Bush Lark
- Slate-colored Boubou
- Slate-throated Whitestart
- Slaty-capped Flycatcher
- Slaty-crowned Antpitta
- Slaty Brushfinch
- Slaty Egret
- Slaty Flowerpiercer
- Slaty Spinetail
- Slender-billed Gull
- Slender-billed Weaver
- Slender-tailed Nightjar
- Small Minivet
- Smoke-colored Pewee
- Smooth-billed Ani
- Snow Bunting
- Snowy-crowned Robin-Chat
- Snowy Egret
- Sociable Weaver
- Social Flycatcher
- Sokoke Scops Owl
- Solitary Sandpiper
- Somali Bee-eater
- Somali Bunting
- Somali Courser
- Somali Ostrich
- Sombre Greenbul
- Song Thrush
- Sooty-capped Chlorospingus
- Sooty-headed Bulbul
- Sooty Chat
- Sooty Gull
- Sooty Thrush
- Souimanga Sunbird
- South African Shelduck
- Southern Black Flycatcher
- Southern Boubou
- Southern Brown-throated Weaver
- Southern Carmine Bee-eater
- Southern Double-collared Sunbird
- Southern Fiscal
- Southern Grey-headed Sparrow
- Southern Ground Hornbill
- Southern Hill Myna
- Southern Lapwing
- Southern Masked Weaver
- Southern Pied Babbler
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Rough-winged Swallow
- Southern White-crowned Shrike
- Southern Yellow-billed Hornbill
- Southern Yellow White-eye
- Spangled Cotinga
- Spanish Sparrow
- Sparkling Violetear
- Speckle-fronted Weaver
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Owl
- Spectacled Weaver
- Speke's Weaver
- Spike-heeled Lark
- Spoon-billed Sandpiper
- Spot-billed Pelican
- Spot-breasted Oriole
- Spot-crowned Euphonia
- Spot-flanked Barbet
- Spot-winged Thrush
- Spotless Starling
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Owl
- Spotted Owlet
- Spotted Palm Thrush
- Spotted Redshank
- Spotted Sandpiper
- Spotted Thick-knee
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Bulbul
- Square-tailed Nightjar
- Squirrel Cuckoo
- Sri Lanka Blue Magpie
- Sri Lanka Drongo
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Hanging Parrot
- Sri Lanka Junglefowl
- Sri Lanka Scimitar Babbler
- Sri Lanka Spurfowl
- Sri Lanka Swallow
- Sri Lanka Woodshrike
- Steely-vented Hummingbird
- Steller's Jay
- Steppe Eagle
- Stock Dove
- Stork-billed Kingfisher
- Stout-billed Cinclodes
- Stout Cisticola
- Strange Weaver
- Straw-tailed Whydah
- Streak-backed Oriole
- Streak-eared Bulbul
- Streak-headed Woodcreeper
- Streak-throated Bush Tyrant
- Streaked Flycatcher
- Streaked Saltator
- Streaked Weaver
- Streaky Seedeater
- Striated Grassbird
- Striated Heron
- Stripe-headed Sparrow
- Stripe-throated Bulbul
- Stripe-throated Jery
- Striped Kingfisher
- Strong-billed Woodcreeper
- Subdesert Mesite
- Sudan Golden Sparrow
- Sulphur-bellied Flycatcher
- Sulphur-breasted Warbler
- Sultan Tit
- Summer Tanager
- Sunbittern
- Superb Starling
- Superb Sunbird
- Superciliaried Hemispingus
- Swahili Sparrow
- Swainson's Hawk
- Swainson's Spurfowl
- Swainson's Thrush
- Swallow-tailed Bee-eater
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swallow Tanager
- Swamp Boubou
- Swamp Flycatcher
- Sword-billed Hummingbird