- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Savi's Warbler
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scarlet-chested Sunbird
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Seychelles Black Parrot
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Shiny Cowbird
- Short-billed Dowitcher
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Silvery-cheeked Hornbill
- Slate-colored Boubou
- Smooth-billed Ani
- Snowy Egret
- Social Flycatcher
- Sokoke Scops Owl
- Sombre Greenbul
- Song Thrush
- Sooty Tern
- South American Tern
- Southern Black Flycatcher
- Southern Giant Petrel
- Southern Ground Hornbill
- Southern Lapwing
- Southern Martin
- Southern Red Bishop
- Spanish Sparrow
- Speckled Mousebird
- Spectacled Thrush
- Spectacled Tyrant
- Spectacled Warbler
- Speke's Weaver
- Spotless Starling
- Spotted Dove
- Spotted Flycatcher
- Spotted Palm Thrush
- Spotted Redshank
- Spotted Sandpiper
- Spotted Thick-knee
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Steppe Eagle
- Stock Dove
- Striated Heron
- Superb Starling
- Swan Goose