- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sardinian Warbler
- Saunders's Tern
- Savanna Hawk
- Savannah Sparrow
- Scaly-breasted Munia
- Scarlet-backed Flowerpecker
- Scarlet Tanager
- Scissor-tailed Flycatcher
- Scopoli's Shearwater
- Seaside Sparrow
- Sedge Wren
- Semipalmated Plover
- Semipalmated Sandpiper
- Shining Sunbird
- Shiny Cowbird
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Jay
- Siberian Stonechat
- Silver-beaked Tanager
- Silver-eared Mesia
- Slender-billed Gull
- Smew
- Smooth-billed Ani
- Snow Goose
- Snowy Egret
- Snowy Plover
- Socotra Cormorant
- Solitary Sandpiper
- Song Sparrow
- Song Thrush
- Sooty Gull
- Sora
- Southern Beardless Tyrannulet
- Southern White-fringed Antwren
- Spanish Sparrow
- Speckled Piculet
- Spectacled Warbler
- Spoon-billed Sandpiper
- Spot-breasted Woodpecker
- Spotless Starling
- Spotted Crake
- Spotted Dove
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandpiper
- Spotted Tody-Flycatcher
- Squacco Heron
- Steppe Eagle
- Stilt Sandpiper
- Stork-billed Kingfisher
- Straight-billed Woodcreeper
- Straw-headed Bulbul
- Streak-eared Bulbul
- Streaked Scrub Warbler
- Streaked Spiderhunter
- Streaked Weaver
- Striated Heron
- Stripe-throated Bulbul
- Striped Cuckoo
- Subalpine Warbler
- Sultan Tit
- Summer Tanager
- Sunda Pygmy Woodpecker
- Swainson's Hawk
- Swainson's Thrush
- Swamp Sparrow