- Sacred Kingfisher
- Saffron Siskin
- Sahul Sunbird
- Salvin's Albatross
- Sandy Gallito
- Sandy Scops Owl
- Sao Tome Thrush
- Sapphire Quail-Dove
- Saunders's Gull
- Savanna Nightjar
- Savi's Warbler
- Scaly-bellied Woodpecker
- Scaly-breasted Lorikeet
- Scaly Ground Roller
- Scaly Spurfowl
- Scaly Thrush (horsfieldi)
- Scarlet-breasted Fruiteater
- Scarlet-chested Sunbird
- Scarlet-crowned Barbet
- Scarlet Minivet
- Schlegel's Asity
- Scimitar-billed Woodcreeper
- Scissor-tailed Nightjar
- Seychelles Bulbul
- Seychelles Scops Owl
- Seychelles Sunbird
- Sharp-tailed Sandpiper
- Sharp-tailed Starling
- Sharpe's Starling
- Shelley's Eagle-Owl
- Shelley's Francolin
- Shelley's Sunbird
- Shining-blue Kingfisher
- Shining Sunbird
- Shore Plover
- Short-legged Ground Roller
- Short-tailed Albatross
- Siberian Sand Plover
- Siberian Thrush
- Sickle-billed Vanga
- Silver Gull
- Silvery-throated Jay
- Silvery Pigeon
- Sind Sparrow
- Sind Woodpecker
- Slaty-backed Forest Falcon
- Slaty-backed Thrush
- Slaty-capped Shrike-Vireo
- Slaty-legged Crake
- Snail-eating Coua
- Snowy Albatross
- Snowy Cotinga
- Society Kingfisher
- Soft-plumaged Petrel
- Somali Bee-eater
- Somali Golden-winged Grosbeak
- Somali Thrush
- Somali Wheatear
- Sombre Kingfisher
- Song Thrush
- Sooty Oystercatcher
- Sooty Thrush
- Souimanga Sunbird
- South Island Piopio
- Southern Carmine Bee-eater
- Southern Double-collared Sunbird
- Southern Giant Petrel
- Southern Marquesan Reed Warbler
- Southern Royal Albatross
- Spanish Imperial Eagle
- Speckled Piculet
- Speckled Tinkerbird
- Spectacled Barwing
- Spectacled Petrel
- Splendid Astrapia
- Spot-crowned Barbet
- Spot-winged Pigeon
- Spot-winged Thrush
- Spotted Bush Warbler
- Spotted Eagle-Owl
- Spotted Owlet
- Spotted Puffbird
- Spotted Rail
- Spotted Shag
- Spotted Whistling Duck
- Spotted Wood Owl
- Spotted Wren
- Sri Lanka Bay Owl
- Sri Lanka Blue Magpie
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Hill Myna
- Sri Lanka Spurfowl
- Sri Lanka Thrush
- Sri Lanka Wood Pigeon
- St. Helena Plover
- St. Lucia Oriole
- Star-spotted Nightjar
- Stitchbird
- Stork-billed Kingfisher
- Streak-backed Oriole
- Streaked Laughingthrush
- Striated Babbler
- Striated Heron
- Striated Wren-Babbler
- Stripe-breasted Woodpecker
- Striped Kingfisher
- Styan's Bulbul
- Sula Lorikeet
- Sula Pitta
- Sulawesi Babbler
- Sulawesi Dwarf Kingfisher
- Sulawesi Lilac Kingfisher
- Sulawesi Scops Owl
- Sumatran Green Pigeon
- Sumatran Treepie
- Sumba Boobook
- Sunda Coucal
- Sunda Thrush
- Sunset Lorikeet
- Superb Fruit Dove
- Superb Sunbird
- Swainson's Thrush
- Swallow-tailed Bee-eater
- Swallow-winged Puffbird
- Swinhoe's Rail
- Swinhoe's Storm Petrel
- Swynnerton's Robin
- Syrian Woodpecker