- Sabine's Gull
- Saker Falcon
- Sand Martin
- Sanderling
- Sandwich Tern
- Sao Tome Prinia
- Sardinian Warbler
- Savanna Hawk
- Scarlet Ibis
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Senegal Parrot
- Shiny Cowbird
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-tailed Hawk
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Silver-beaked Tanager
- Slender-billed Gull
- Slender-billed Weaver
- Smew
- Smooth-billed Ani
- Snowy Egret
- Snowy Owl
- Solitary Sandpiper
- Song Thrush
- Sooty Flycatcher
- Southern Beardless Tyrannulet
- Southern Masked Weaver
- Southern Mealy Amazon
- Speckle-fronted Weaver
- Speckled Tinkerbird
- Spectacled Weaver
- Splendid Starling
- Spotted Crake
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Greenbul
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandpiper
- Spotted Tody-Flycatcher
- Spur-winged Lapwing
- Squacco Heron
- Standard-winged Nightjar
- Stilt Sandpiper
- Straight-billed Woodcreeper
- Striated Heron
- Striped Cuckoo
- Subalpine Warbler
- Superb Sunbird
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swamp Boubou
- Swan Goose