- Sabota Lark
- Saddle-billed Stork
- Saffron Finch
- Sahel Bush Sparrow
- Sahel Paradise Whydah
- Sanderling
- Sandwich Tern
- Sarus Crane
- Savanna Hawk
- Sayaca Tanager
- Scaled Dove
- Scaly-feathered Weaver
- Scaly Ground Roller
- Scarlet-chested Sunbird
- Scarlet-headed Blackbird
- Scarlet-rumped Tanager
- Scarlet-rumped Tanager (costaricensis)
- Scarlet Ibis
- Scarlet Macaw
- Scheepmaker's Crowned Pigeon
- Schlegel's Asity
- Scissor-tailed Kite
- Secretarybird
- Sedge Warbler
- Senegal Coucal
- Senegal Eremomela
- Senegal Lapwing
- Senegal Parrot
- Senegal Thick-knee
- Shaft-tailed Whydah
- Shikra
- Shoebill
- Short-crested Flycatcher
- Short-eared Owl
- Short-toed Snake Eagle
- Siberian Stonechat
- Sickle-billed Vanga
- Sickle-winged Chat
- Silver-throated Tanager
- Silverbird
- Sirkeer Malkoha
- Slender-billed Gull
- Slender-billed Weaver
- Small Ground Finch
- Smew
- Snail Kite
- Snow Bunting
- Snowy-crowned Robin-Chat
- Snowy Egret
- Sociable Weaver
- Social Flycatcher
- Solitary Cacique
- Song Thrush
- Sooty Chat
- Sooty Shearwater
- Souimanga Sunbird
- South African Shelduck
- Southern Black Flycatcher
- Southern Black Korhaan
- Southern Boubou
- Southern Brown Kiwi
- Southern Carmine Bee-eater
- Southern Double-collared Sunbird
- Southern Fiscal
- Southern Grey-headed Sparrow
- Southern Ground Hornbill
- Southern Lapwing
- Southern Masked Weaver
- Southern Pied Babbler
- Southern Pochard
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Screamer
- Southern Yellow-billed Hornbill
- Speckle-fronted Weaver
- Speckled Mousebird
- Speckled Pigeon
- Speckled Tinkerbird
- Spectacled Eider
- Spectacled Tetraka
- Spike-heeled Lark
- Splendid Starling
- Spot-billed Pelican
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Owlet
- Spotted Redshank
- Spotted Sandpiper
- Spotted Thick-knee
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Nightjar
- Sri Lanka Green Pigeon
- Sri Lanka Swallow
- Standard-winged Nightjar
- Steller's Sea Eagle
- Steppe Eagle
- Stone Partridge
- Streak-throated Woodpecker
- Streaky Seedeater
- Striated Heron
- Striped Kingfisher
- Subtropical Cacique
- Sudan Golden Sparrow
- Sunbittern
- Sungrebe
- Superb Sunbird
- Swainson's Spurfowl
- Swallow-tailed Bee-eater
- Swallow-tailed Gull
- Swamp Boubou
- Swee Waxbill