- Sabota Lark
- Saddle-billed Stork
- Saffron-crowned Tanager
- Saffron Finch
- Sahel Paradise Whydah
- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sapphire-spangled Emerald
- Sapphire-vented Puffleg
- Sardinian Warbler
- Saunders's Tern
- Savi's Warbler
- Sayaca Tanager
- Scale-throated Earthcreeper
- Scaly-breasted Hummingbird
- Scaly-breasted Munia
- Scaly-feathered Weaver
- Scarlet-bellied Mountain Tanager
- Scarlet-chested Sunbird
- Scarlet-crowned Barbet
- Scarlet-rumped Tanager
- Scarlet-rumped Tanager (costaricensis)
- Scarlet-thighed Dacnis
- Scarlet Ibis
- Scarlet Macaw
- Scintillant Hummingbird
- Scopoli's Shearwater
- Scrub Blackbird
- Scrub Euphonia
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Senegal Coucal
- Senegal Lapwing
- Senegal Parrot
- Senegal Thick-knee
- Seychelles Black Parrot
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Fody
- Seychelles Magpie-Robin
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Seychelles Swiftlet
- Seychelles Warbler
- Shikra
- Shining Sunbeam
- Shiny Cowbird
- Shoebill
- Short-crested Flycatcher
- Short-eared Owl
- Short-toed Rock Thrush
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Short-winged Cisticola
- Sickle-winged Guan
- Silver-backed Tanager
- Silver-beaked Tanager
- Silver-throated Tanager
- Silver Teal
- Silverbird
- Silvery Grebe
- Slate-colored Hawk
- Slate-throated Whitestart
- Slaty-backed Chat-Tyrant
- Slaty-backed Nightingale-Thrush
- Slaty Brushfinch
- Slaty Flowerpiercer
- Slender-billed Gull
- Slender-billed Weaver
- Small Minivet
- Smoke-colored Pewee
- Smoky-brown Woodpecker
- Smooth-billed Ani
- Snail Kite
- Snow Bunting
- Snowy-crowned Robin-Chat
- Snowy Egret
- Sociable Weaver
- Social Flycatcher
- Somali Bee-eater
- Song Sparrow
- Song Thrush
- Sooty-capped Chlorospingus
- Sooty Chat
- Sooty Thrush
- South African Shelduck
- Southern Beardless Tyrannulet
- Southern Black Korhaan
- Southern Crested Guineafowl
- Southern Double-collared Sunbird
- Southern Fiscal
- Southern Giant Petrel
- Southern Grey-headed Sparrow
- Southern Lapwing
- Southern Martin
- Southern Masked Weaver
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Rough-winged Swallow
- Southern Screamer
- Southern Yellow-billed Hornbill
- Spangle-cheeked Tanager
- Spanish Imperial Eagle
- Spanish Sparrow
- Sparkling Violetear
- Speckle-fronted Weaver
- Speckled Chachalaca
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Pigeon
- Speckled Tanager
- Spectacled Tyrant
- Spectacled Warbler
- Spectacled Weaver
- Spectacled Whitestart
- Speke's Weaver
- Spike-heeled Lark
- Spix's Guan
- Splendid Starling
- Spot-billed Ground Tyrant
- Spot-billed Pelican
- Spot-crowned Euphonia
- Spot-crowned Woodcreeper
- Spot-flanked Barbet
- Spot-winged Pigeon
- Spot-winged Thrush
- Spotless Starling
- Spotted Antbird
- Spotted Crake
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Palm Thrush
- Spotted Redshank
- Spotted Sandpiper
- Spotted Tanager
- Spotted Thick-knee
- Spotted Towhee
- Spotted Wood Quail
- Spotted Woodcreeper
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Bulbul
- Squirrel Cuckoo
- Sri Lanka Blue Magpie
- Sri Lanka Drongo
- Sri Lanka Green Pigeon
- Sri Lanka Junglefowl
- Sri Lanka Scimitar Babbler
- Sri Lanka Swallow
- Sri Lanka White-eye
- Sri Lanka Woodshrike
- Steller's Jay
- Stock Dove
- Stork-billed Kingfisher
- Stout-billed Cinclodes
- Streak-backed Oriole
- Streak-backed Tit-Spinetail
- Streak-headed Woodcreeper
- Streak-throated Bush Tyrant
- Streak-throated Canastero
- Streaked Flycatcher
- Streaked Xenops
- Streaky-headed Seedeater
- Striated Heron
- Stripe-headed Sparrow
- Stripe-tailed Hummingbird
- Stripe-throated Hermit
- Striped Kingfisher
- Strong-billed Woodcreeper
- Sudan Golden Sparrow
- Summer Tanager
- Sunbittern
- Sungrebe
- Superb Starling
- Swainson's Spurfowl
- Swallow-tailed Bee-eater
- Swallow-tailed Hummingbird
- Swallow-tailed Kite
- Swallow Tanager
- Swamp Flycatcher
- Swee Waxbill
- Sword-billed Hummingbird
- Sykes's Warbler