- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sardinian Warbler
- Saunders's Tern
- Savanna Hawk
- Savannah Sparrow
- Scaly-breasted Hummingbird
- Scaly-breasted Munia
- Scarlet-backed Flowerpecker
- Scarlet-rumped Tanager
- Scarlet-thighed Dacnis
- Scarlet Macaw
- Scarlet Tanager
- Scintillant Hummingbird
- Scissor-tailed Flycatcher
- Scopoli's Shearwater
- Scrub Euphonia
- Seaside Sparrow
- Sedge Wren
- Semipalmated Plover
- Semipalmated Sandpiper
- Semiplumbeous Hawk
- Shining Sunbird
- Shiny Cowbird
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siamese Pied Myna
- Siberian Blue Robin
- Siberian Jay
- Siberian Sand Plover
- Siberian Stonechat
- Silver-beaked Tanager
- Silver-eared Mesia
- Silver-throated Tanager
- Slate-throated Whitestart
- Slaty-backed Nightingale-Thrush
- Slaty-capped Flycatcher
- Slaty-tailed Trogon
- Slaty Flowerpiercer
- Slender-billed Gull
- Smew
- Smoky-brown Woodpecker
- Smooth-billed Ani
- Snow Goose
- Snowy Egret
- Snowy Plover
- Social Flycatcher
- Socotra Cormorant
- Solitary Sandpiper
- Song Sparrow
- Song Thrush
- Sooty-capped Chlorospingus
- Sooty-faced Finch
- Sooty-headed Bulbul
- Sooty Gull
- Sooty Thrush
- Sora
- Southern Beardless Tyrannulet
- Southern Lapwing
- Southern White-fringed Antwren
- Spangle-cheeked Tanager
- Spanish Sparrow
- Speckled Piculet
- Spectacled Warbler
- Spoon-billed Sandpiper
- Spot-breasted Woodpecker
- Spot-crowned Woodcreeper
- Spotless Starling
- Spotted Antbird
- Spotted Crake
- Spotted Dove
- Spotted Flycatcher
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandpiper
- Spotted Tody-Flycatcher
- Spotted Towhee
- Squacco Heron
- Steppe Eagle
- Stilt Sandpiper
- Stork-billed Kingfisher
- Straight-billed Woodcreeper
- Straw-headed Bulbul
- Streak-backed Oriole
- Streak-eared Bulbul
- Streak-headed Woodcreeper
- Streaked Flycatcher
- Streaked Scrub Warbler
- Streaked Spiderhunter
- Streaked Weaver
- Striated Grassbird
- Striated Heron
- Stripe-headed Sparrow
- Stripe-throated Bulbul
- Striped Cuckoo
- Sultan Tit
- Summer Tanager
- Sunda Pygmy Woodpecker
- Sungrebe
- Surfbird
- Swainson's Hawk
- Swainson's Thrush
- Swamp Sparrow