- Sabine's Gull
- Saddle-billed Stork
- Sand Martin
- Sand Partridge
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Scopoli's Shearwater
- Sedge Warbler
- Sentinel Rock Thrush
- Short-eared Owl
- Short-toed Snake Eagle
- Shy Albatross
- Siberian Blue Robin
- Slender-billed Gull
- Snow Bunting
- Sombre Greenbul
- Sombre Tit
- Sooty Gull
- Southern Black Korhaan
- Southern Boubou
- Southern Double-collared Sunbird
- Southern Fiscal
- Southern Ground Hornbill
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Yellow-billed Hornbill
- Spanish Imperial Eagle
- Spanish Sparrow
- Speckled Mousebird
- Speckled Pigeon
- Spoon-billed Sandpiper
- Spotless Starling
- Spotted Crake
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandgrouse
- Spur-winged Lapwing
- Squacco Heron
- Stock Dove
- Subalpine Warbler
- Swainson's Spurfowl
- Swee Waxbill
- Sykes's Warbler
- Syrian Woodpecker