- Salvadori's Pheasant
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Sarus Crane
- Savanna Hawk
- Savannah Sparrow
- Scaly-breasted Munia
- Scarlet-rumped Tanager
- Scarlet-thighed Dacnis
- Scarlet Ibis
- Scarlet Macaw
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Parrot
- Shiny Cowbird
- Short-eared Owl
- Short-tailed Hawk
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Jay
- Silver-beaked Tanager
- Silver-throated Tanager
- Silver Pheasant
- Slender-billed Gull
- Slender-billed Kite
- Smoky-brown Woodpecker
- Smooth-billed Ani
- Snow Bunting
- Snow Goose
- Snowy Egret
- Solitary Sandpiper
- Sombre Tit
- Song Sparrow
- Song Thrush
- Sooty Shearwater
- Southern House Wren
- Southern Pochard
- Southern Screamer
- Spanish Imperial Eagle
- Spanish Sparrow
- Spectacled Warbler
- Spotless Starling
- Spotted Crake
- Spotted Dove
- Spotted Flycatcher
- Spotted Laughingthrush
- Spotted Redshank
- Spotted Sandgrouse
- Spotted Sandpiper
- Spotted Tody-Flycatcher
- Spur-winged Lapwing
- Squacco Heron
- Sri Lanka Green Pigeon
- Stork-billed Kingfisher
- Striated Heron
- Striped Cuckoo
- Summer Tanager
- Sungrebe
- Surf Scoter
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swamp Sparrow
- Swan Goose