- Sabine's Gull
- Sacred Kingfisher
- Saddle-billed Stork
- Saker Falcon
- Sanderling
- Sandwich Tern
- Sapphire-vented Puffleg
- Sardinian Warbler
- Satin Flycatcher
- Scale-crested Pygmy Tyrant
- Scaled Fruiteater
- Scaly-breasted Lorikeet
- Scaly-throated Foliage-gleaner
- Scaly-throated Honeyguide
- Scarlet-bellied Mountain Tanager
- Scarlet-chested Sunbird
- Scarlet Ibis
- Scissor-tailed Flycatcher
- Scrub Blackbird
- Scrub Euphonia
- Secretarybird
- Semipalmated Plover
- Senegal Thick-knee
- Sentinel Lark
- Sharp-tailed Sandpiper
- Shining Sunbeam
- Shiny Cowbird
- Short-tailed Shearwater
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Shy Albatross
- Silver-throated Tanager
- Silver Gull
- Silvereye
- Silvery-cheeked Hornbill
- Singing Quail
- Slate-colored Boubou
- Slate-throated Whitestart
- Slender-tailed Nightjar
- Smoky-brown Woodpecker
- Snowy Egret
- Social Flycatcher
- Somali Crow
- Song Thrush
- Sooty Chat
- Sooty Oystercatcher
- Southern Ground Hornbill
- Southern House Wren
- Southern Pochard
- Southern Rough-winged Swallow
- Sparkling Violetear
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Monarch
- Spectacled Weaver
- Spectacled Whitestart
- Spot-breasted Lapwing
- Spot-flanked Barbet
- Spotted Dove
- Spotted Flycatcher
- Spotted Palm Thrush
- Spotted Redshank
- Spotted Sandpiper
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Squirrel Cuckoo
- Stock Dove
- Stout-billed Cinclodes
- Streak-headed Woodcreeper
- Streaked Flycatcher
- Streaky Seedeater
- Striated Caracara
- Striated Heron
- Striated Thornbill
- Striped Kingfisher
- Sulphur-crested Cockatoo
- Summer Tanager
- Sun Parakeet
- Sunbittern
- Superb Fairywren
- Superb Fruit Dove
- Superb Starling
- Superciliaried Hemispingus
- Swahili Sparrow
- Swainson's Sparrow
- Swallow-tailed Kite
- Swallow Tanager
- Swan Goose
- Sword-billed Hummingbird