- Sabine's Gull
- Sacred Kingfisher
- Sahel Bush Sparrow
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scarlet-chested Sunbird
- Scarlet Minivet
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Senegal Eremomela
- Senegal Parrot
- Senegal Thick-knee
- Short-billed Dowitcher
- Short-eared Owl
- Siberian Stonechat
- Silver Gull
- Silvereye
- Slaty-backed Forktail
- Slaty-breasted Rail
- Smew
- Snow Bunting
- Snow Goose
- Snowy Egret
- Song Thrush
- Sooty-headed Bulbul
- Sora
- South Island Oystercatcher
- Speckled Pigeon
- Spotted Dove
- Spotted Flycatcher
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandpiper
- Spotted Shag
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Stilt Sandpiper
- Stock Dove
- Stork-billed Kingfisher
- Streak-breasted Scimitar Babbler
- Striated Heron
- Sudan Golden Sparrow
- Sunda Pygmy Woodpecker
- Swallow-tailed Bee-eater
- Swinhoe's White-eye