- Saddle-billed Stork
- Sahel Bush Sparrow
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Savi's Warbler
- Scale-crested Pygmy Tyrant
- Scaly-breasted Hummingbird
- Scaly-breasted Illadopsis
- Scaly-breasted Munia
- Scaly-throated Honeyguide
- Scaly Babbler
- Scaly Chatterer
- Scaly Spurfowl
- Scarce Swift
- Scarlet-chested Sunbird
- Scarlet-rumped Tanager
- Scarlet-rumped Tanager (costaricensis)
- Scarlet-thighed Dacnis
- Scarlet Macaw
- Schalow's Turaco
- Scissor-tailed Flycatcher
- Scissor-tailed Kite
- Scopoli's Shearwater
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Senegal Lapwing
- Senegal Parrot
- Senegal Thick-knee
- Serendib Scops Owl
- Sharpe's Longclaw
- Sharpe's Starling
- Shelley's Francolin
- Shelley's Greenbul
- Shikra
- Shining-blue Kingfisher
- Shining Honeycreeper
- Shining Sunbird
- Shiny Cowbird
- Shoebill
- Short-eared Owl
- Short-tailed Hawk
- Short-tailed Lark
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Short-winged Cisticola
- Siberian Sand Plover
- Silver-throated Tanager
- Silverbird
- Silvery-cheeked Hornbill
- Silvery Grebe
- Simple Greenbul
- Singing Cisticola
- Slate-colored Boubou
- Slate-throated Whitestart
- Slaty-backed Nightingale-Thrush
- Slaty-capped Flycatcher
- Slaty-tailed Trogon
- Slaty Spinetail
- Slender-billed Greenbul
- Slender-billed Gull
- Slender-billed Starling
- Slender-billed Weaver
- Slender-tailed Nightjar
- Small Minivet
- Small Pratincole
- Smew
- Smooth-billed Ani
- Snow Bunting
- Snow Goose
- Snowcap
- Snowy-crowned Robin-Chat
- Snowy Cotinga
- Snowy Egret
- Social Flycatcher
- Sokoke Pipit
- Sokoke Scops Owl
- Solitary Sandpiper
- Somali Bee-eater
- Somali Bunting
- Somali Courser
- Somali Crombec
- Somali Fiscal
- Somali Ostrich
- Somali Short-toed Lark
- Somali Sparrow
- Sombre Greenbul
- Sombre Nightjar
- Song Thrush
- Sooty-capped Chlorospingus
- Sooty-faced Finch
- Sooty Chat
- Sooty Gull
- Sooty Tern
- Sooty Thrush
- Southern Banded Snake Eagle
- Southern Beardless Tyrannulet
- Southern Black Flycatcher
- Southern Citril
- Southern Double-collared Sunbird
- Southern Grosbeak-Canary
- Southern Ground Hornbill
- Southern Hill Myna
- Southern Lapwing
- Southern Pochard
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Rough-winged Swallow
- Southern Tropical Pewee
- Southern Yellow-billed Hornbill
- Spangle-cheeked Tanager
- Spanish Sparrow
- Speckle-breasted Woodpecker
- Speckle-fronted Weaver
- Speckled Mousebird
- Speckled Pigeon
- Speckled Tinkerbird
- Spectacled Tern
- Spectacled Warbler
- Spectacled Weaver
- Speke's Weaver
- Splendid Starling
- Splendid Sunbird
- Spot-billed Pelican
- Spot-flanked Barbet
- Spot-flanked Gallinule
- Spot-winged Thrush
- Spotless Starling
- Spotted Crake
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Ground Thrush
- Spotted Nutcracker
- Spotted Palm Thrush
- Spotted Redshank
- Spotted Sandgrouse
- Spotted Sandpiper
- Spotted Thick-knee
- Spotted Wood Quail
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Bulbul
- Square-tailed Drongo
- Squirrel Cuckoo
- Sri Lanka Blue Magpie
- Sri Lanka Drongo
- Sri Lanka Frogmouth
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Hanging Parrot
- Sri Lanka Junglefowl
- Sri Lanka Spurfowl
- Sri Lanka Whistling Thrush
- Sri Lanka White-eye
- Sri Lanka Woodshrike
- Steppe Eagle
- Stock Dove
- Stork-billed Kingfisher
- Stout Cisticola
- Straw-tailed Whydah
- Streak-headed Woodcreeper
- Streaked Flycatcher
- Streaked Scrub Warbler
- Streaked Weaver
- Streaky Seedeater
- Striated Heron
- Striolated Bunting
- Stripe-cheeked Greenbul
- Stripe-tailed Hummingbird
- Striped Cuckoo
- Striped Kingfisher
- Striped Pipit
- Striped Woodpecker
- Strong-billed Woodcreeper
- Sudan Golden Sparrow
- Summer Tanager
- Sungrebe
- Superb Starling
- Superb Sunbird
- Surfbird
- Swahili Sparrow
- Swainson's Sparrow
- Swainson's Spurfowl
- Swallow-tailed Bee-eater
- Swallow-tailed Kite
- Swamp Flycatcher
- Syrian Woodpecker