- Sacred Kingfisher
- Sand Martin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Sarus Crane
- Savanna Hawk
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scarlet-backed Flowerpecker
- Scarlet-headed Flowerpecker
- Scarlet-rumped Cacique
- Scarlet Ibis
- Scarlet Macaw
- Scarlet Tanager
- Schalow's Turaco
- Screaming Piha
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Fody
- Seychelles Magpie-Robin
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Shikra
- Shiny Cowbird
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-tailed Hawk
- Short-tailed Parrot
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Sand Plover
- Siberian Stonechat
- Silver-beaked Tanager
- Silver-throated Tanager
- Silvery-cheeked Hornbill
- Slate-colored Boubou
- Slate-colored Grosbeak
- Small Pratincole
- Smoky-fronted Tody-Flycatcher
- Smooth-billed Ani
- Snail Kite
- Snowy Egret
- Social Flycatcher
- Solitary Sandpiper
- Song Sparrow
- Song Thrush
- Sooty-headed Bulbul
- Sooty Gull
- Sooty Tern
- Southern Beardless Tyrannulet
- Southern Lapwing
- Southern Mouse-colored Tyrannulet
- Southern Rough-winged Swallow
- Southern White-fringed Antwren
- Spanish Sparrow
- Sparkling Violetear
- Speckle-fronted Weaver
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Thrush
- Spectacled Warbler
- Speke's Weaver
- Spot-backed Antbird
- Spot-billed Pelican
- Spot-breasted Woodpecker
- Spot-tailed Nightjar
- Spotless Starling
- Spotted Antbird
- Spotted Dove
- Spotted Flycatcher
- Spotted Nothura
- Spotted Owlet
- Spotted Sandpiper
- Spotted Tanager
- Spotted Tody-Flycatcher
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Squirrel Cuckoo
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Swallow
- St. Lucia Amazon
- St. Lucia Black Finch
- St. Lucia Warbler
- Steppe Eagle
- Stock Dove
- Straight-billed Hermit
- Straight-billed Woodcreeper
- Streak-eared Bulbul
- Streaked Flycatcher
- Streaked Saltator
- Striated Heron
- Striped Cuckoo
- Sulphur-bellied Flycatcher
- Summer Tanager
- Sunbittern
- Sungrebe
- Superb Starling
- Swahili Sparrow
- Swainson's Thrush
- Swallow-tailed Hummingbird
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swan Goose