- Sabine's Gull
- Saffron Toucanet
- Sand Martin
- Sand Partridge
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Satin Flycatcher
- Savi's Warbler
- Scale-feathered Malkoha
- Scaled Quail
- Scaly-breasted Honeyeater
- Scarlet-backed Flowerpecker
- Scarlet-chested Parrot
- Scarlet-collared Flowerpecker
- Scarlet-rumped Trogon
- Scarlet Finch
- Scarlet Minivet
- Sedge Warbler
- See-see Partridge
- Seram Boobook
- Seram Golden Bulbul
- Shining Sunbeam
- Short-eared Owl
- Short-tailed Starling
- Short-toed Snake Eagle
- Shovel-billed Kookaburra
- Shy Albatross
- Siamese Fireback
- Siberian Crane
- Siberian Jay
- Siberian Rubythroat (beicki)
- Siberian Thrush
- Sikkim Wedge-billed Babbler
- Silver-breasted Broadbill
- Silver-capped Fruit Dove
- Silver-eared Honeyeater
- Silver-eared Mesia
- Silver-tipped Imperial Pigeon
- Singing Quail
- Slaty-backed Thrush
- Slaty-headed Longbill
- Slaty-headed Parakeet
- Slaty Cuckooshrike
- Slender-billed Curlew
- Slender-billed Scimitar Babbler
- Small Minivet
- Small Pratincole
- Smew
- Snow Bunting
- Snow Goose
- Snow Partridge
- Snow Pigeon
- Snowy Owl
- Sociable Lapwing
- Soft-plumaged Petrel
- Solomons Cockatoo
- Solomons Monarch
- Sombre Pigeon
- Sombre Tit
- Song Parrot
- Song Thrush
- Sooty Falcon
- Sooty Oystercatcher
- Southern Cassowary
- Southern Giant Petrel
- Southern Scrub Robin
- Spangled Drongo
- Spangled Kookaburra
- Spanish Sparrow
- Sparkling-tailed Woodstar
- Sparkling Violetear
- Speckled Piculet
- Spectacled Barwing
- Spectacled Finch
- Spectacled Monarch
- Spectacled Petrel
- Spectacled Warbler
- Spike-heeled Lark
- Spinifex Pigeon
- Spiny-cheeked Honeyeater
- Spoon-billed Sandpiper
- Spot-bellied Bobwhite
- Spot-billed Toucanet
- Spot-breasted Parrotbill
- Spot-winged Grosbeak
- Spot-winged Wood Quail
- Spotless Crake
- Spotless Starling
- Spotted Berrypecker
- Spotted Crake
- Spotted Elachura
- Spotted Flycatcher
- Spotted Forktail
- Spotted Harrier
- Spotted Laughingthrush
- Spotted Nightjar
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandpiper
- Spotted Wood Kingfisher
- Spotted Wood Quail
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Kite
- Squatter Pigeon
- Sri Lanka Blue Magpie
- Sri Lanka Spurfowl
- Starred Wood Quail
- Steel-blue Flycatcher
- Steely-vented Hummingbird
- Steller's Eider
- Stock Dove
- Stout-billed Cuckooshrike
- Straw-necked Ibis
- Streak-throated Barwing
- Streak-throated Swallow
- Streaked Wren-Babbler
- Striated Heron
- Striated Yuhina
- Stripe-faced Wood Quail
- Stripe-tailed Hummingbird
- Striped Laughingthrush
- Stubble Quail
- Sulawesi Ground Dove
- Sulawesi Pygmy Woodpecker
- Sulawesi Serpent Eagle
- Sultan Tit
- Sumatran Trogon
- Sunda Pygmy Woodpecker
- Superb Lyrebird
- Superb Parrot
- Surf Scoter
- Swallow-tailed Hummingbird
- Swallow-tailed Kite
- Swinhoe's Minivet
- Swinhoe's Pheasant
- Sykes's Nightjar