- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Sarus Crane
- Saunders's Tern
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scaly-naped Pigeon
- Scarlet-backed Flowerpecker
- Scarlet Ibis
- Scopoli's Shearwater
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Kestrel
- Seychelles Sunbird
- Shiny Cowbird
- Shoebill
- Short-eared Owl
- Short-tailed Hawk
- Short-toed Treecreeper
- Silver Pheasant
- Slender-billed Gull
- Slender-billed Kite
- Small Pratincole
- Smooth-billed Ani
- Snow Goose
- Snowy-crowned Robin-Chat
- Snowy Egret
- Social Flycatcher
- Socotra Cormorant
- Solitary Sandpiper
- Song Thrush
- Sooty-headed Bulbul
- Sooty Gull
- Sooty Tern
- South African Shelduck
- Southern Beardless Tyrannulet
- Southern Cassowary
- Southern Grey Shrike
- Southern Ground Hornbill
- Southern Mealy Amazon
- Spanish Sparrow
- Spectacled Thrush
- Splendid Sunbird
- Spot-billed Pelican
- Spotless Starling
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Spur-winged Lapwing
- Squacco Heron
- Stilt Sandpiper
- Stork-billed Kingfisher
- Straw-headed Bulbul
- Striated Grassbird
- Striated Heron
- Sun Parakeet
- Sunda Cuckoo
- Swan Goose
- Swinhoe's Snipe
- Syrian Woodpecker