- Saddle-billed Stork
- Saffron Finch
- Sahel Bush Sparrow
- Sakalava Weaver
- Saker Falcon
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Saunders's Tern
- Savanna Hawk
- Savi's Warbler
- Saxaul Sparrow
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scaly Ground Roller
- Scaly Spurfowl
- Scaly Thrush
- Scarlet-bellied Mountain Tanager
- Scarlet-chested Sunbird
- Scarlet Ibis
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Batis
- Senegal Coucal
- Senegal Eremomela
- Senegal Thick-knee
- Sepia-capped Flycatcher
- Seychelles Bulbul
- Seychelles Fody
- Seychelles Magpie-Robin
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Seychelles Warbler
- Sharpe's Apalis
- Shikra
- Shining-blue Kingfisher
- Shining Sunbeam
- Shining Sunbird
- Shiny Cowbird
- Short-billed Dowitcher
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Blue Robin
- Siberian Jay
- Siberian Rubythroat (beicki)
- Siberian Stonechat
- Sickle-billed Vanga
- Silver-beaked Tanager
- Silver-breasted Broadbill
- Silver Pheasant
- Silverbird
- Silvery-cheeked Hornbill
- Simple Greenbul
- Sirkeer Malkoha
- Slate-colored Boubou
- Slate-colored Seedeater
- Slate-throated Whitestart
- Slaty-backed Forktail
- Slaty-breasted Rail
- Slaty-crowned Antpitta
- Slaty Brushfinch
- Slender-billed Gull
- Slender-tailed Nightjar
- Small Minivet
- Small Pratincole
- Smew
- Smooth-billed Ani
- Snail Kite
- Snow Bunting
- Snow Goose
- Snowy Egret
- Sociable Lapwing
- Social Flycatcher
- Socotra Cormorant
- Solitary Sandpiper
- Somali Crow
- Somali Fiscal
- Somali Ostrich
- Song Sparrow
- Song Thrush
- Sooty Chat
- Sooty Gull
- Souimanga Sunbird
- South American Snipe
- Southern Ground Hornbill
- Southern Lapwing
- Southern Mountain Cacique
- Southern Red Bishop
- Southern Rough-winged Swallow
- Southern White-fringed Antwren
- Spangled Cotinga
- Spanish Imperial Eagle
- Spanish Sparrow
- Sparkling Violetear
- Speckle-fronted Weaver
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Pigeon
- Speckled Tinkerbird
- Spectacled Tetraka
- Spectacled Warbler
- Spectacled Weaver
- Speke's Weaver
- Splendid Starling
- Spoon-billed Sandpiper
- Spot-breasted Lapwing
- Spot-breasted Woodpecker
- Spotless Starling
- Spotted Dove
- Spotted Flycatcher
- Spotted Nutcracker
- Spotted Owlet
- Spotted Palm Thrush
- Spotted Redshank
- Spotted Sandgrouse
- Spotted Sandpiper
- Spotted Thick-knee
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Squirrel Cuckoo
- Steel-blue Whydah
- Stejneger's Scoter
- Stejneger's Stonechat
- Steller's Eider
- Steppe Eagle
- Stilt Sandpiper
- Stout-billed Cinclodes
- Straight-billed Woodcreeper
- Straw-tailed Whydah
- Streak-eared Bulbul
- Streak-headed Woodcreeper
- Streak-necked Flycatcher
- Streak-throated Woodpecker
- Streaked Flycatcher
- Streaked Scrub Warbler
- Streaky Seedeater
- Striated Heron
- Stripe-throated Bulbul
- Stripe-throated Jery
- Striped Kingfisher
- Striped Owl
- Subalpine Warbler
- Subdesert Brush Warbler
- Subdesert Mesite
- Sulphur-bellied Warbler
- Sultan Tit
- Summer Tanager
- Sunbittern
- Superb Starling
- Superb Sunbird
- Superciliaried Hemispingus
- Surf Scoter
- Surfbird
- Swahili Sparrow
- Swainson's Sparrow
- Swainson's Thrush
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swamp Sparrow
- Swan Goose
- Sykes's Warbler
- Syrian Woodpecker