- Saddle-billed Stork
- Salmon-crested Cockatoo
- Salvadori's Pheasant
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Sarus Crane
- Scaly-breasted Lorikeet
- Scarlet-chested Parrot
- Scarlet-headed Blackbird
- Scarlet Ibis
- Scarlet Macaw
- Secretarybird
- Sedge Warbler
- Senegal Parrot
- Shoebill
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siamese Fireback
- Siberian Crane
- Siberian Jay
- Sickle-billed Vanga
- Silver Pheasant
- Silver Teal
- Silvery-cheeked Hornbill
- Slender-billed Gull
- Slender-billed Parakeet
- Smew
- Snow Bunting
- Snow Goose
- Snowy-crowned Robin-Chat
- Snowy Owl
- Song Thrush
- South African Shelduck
- Southern Bald Ibis
- Southern Ground Hornbill
- Southern Lapwing
- Southern Pochard
- Southern Screamer
- Southern White-faced Owl
- Southern Yellow-billed Hornbill
- Spangled Cotinga
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Eider
- Spectacled Owl
- Spectacled Warbler
- Spectacled Weaver
- Spot-flanked Barbet
- Spotted Dove
- Spotted Flycatcher
- Spotted Redshank
- Spotted Thick-knee
- Spotted Whistling Duck
- Spur-winged Goose
- Steller's Eider
- Steller's Jay
- Steller's Sea Eagle
- Straw-necked Ibis
- Striated Heron
- Sulawesi Ground Dove
- Sulawesi Hornbill
- Sulphur-crested Cockatoo
- Sumatran Laughingthrush
- Sunbittern
- Superb Parrot
- Superb Starling
- Swan Goose