- Saddle-billed Stork
- Saffron Finch
- Sahel Bush Sparrow
- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Santa Marta Antbird
- Santa Marta Antpitta
- Santa Marta Brushfinch
- Santa Marta Foliage-gleaner
- Santa Marta Mountain Tanager
- Santa Marta Warbler
- Santa Marta Woodstar
- Sardinian Warbler
- Saunders's Tern
- Savanna Hawk
- Savannah Sparrow
- Scaled Dove
- Scaled Piculet
- Scaly-breasted Hummingbird
- Scaly-breasted Munia
- Scarlet-backed Flowerpecker
- Scarlet-bellied Mountain Tanager
- Scarlet-fronted Parakeet
- Scarlet-rumped Tanager
- Scarlet-thighed Dacnis
- Scarlet Macaw
- Scarlet Tanager
- Scintillant Hummingbird
- Scissor-tailed Flycatcher
- Scopoli's Shearwater
- Scrub Euphonia
- Scrub Tanager
- Seaside Sparrow
- Sedge Wren
- Semipalmated Plover
- Semipalmated Sandpiper
- Semiplumbeous Hawk
- Shining Sunbeam
- 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 Stonechat
- Sickle-winged Guan
- Sierra Nevada Antpitta
- Sierra Nevada Brushfinch
- Silver-beaked Tanager
- Silver-eared Mesia
- Silver-throated Tanager
- Singing Cisticola
- Slate-throated Whitestart
- Slaty-backed Nightingale-Thrush
- Slaty-capped Flycatcher
- Slaty-crowned Antpitta
- Slaty-tailed Trogon
- Slaty Brushfinch
- Slaty Flowerpiercer
- Slender-billed Gull
- Slender-billed Starling
- Smew
- Smoky-brown Woodpecker
- Smooth-billed Ani
- Snow Goose
- Snowy Egret
- Snowy Plover
- Social Flycatcher
- Socotra Cormorant
- Solitary Sandpiper
- Somali Fiscal
- Somali Ostrich
- 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
- Sparkling Violetear
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Piculet
- Speckled Pigeon
- Spectacled Warbler
- Spoon-billed Sandpiper
- Spot-breasted Lapwing
- Spot-breasted Woodpecker
- Spot-crowned Woodcreeper
- Spot-flanked Gallinule
- Spotless Starling
- Spotted Antbird
- Spotted Crake
- Spotted Dove
- Spotted Flycatcher
- Spotted Nutcracker
- Spotted Redshank
- Spotted Sandpiper
- Spotted Tody-Flycatcher
- Spotted Towhee
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Squirrel Cuckoo
- Steely-vented Hummingbird
- Steppe Eagle
- Stilt Sandpiper
- Stork-billed Kingfisher
- Straight-billed Woodcreeper
- Straw-headed Bulbul
- Streak-backed Oriole
- Streak-eared Bulbul
- Streak-headed Woodcreeper
- Streak-necked Flycatcher
- Streaked Flycatcher
- Streaked Saltator
- Streaked Scrub Warbler
- Streaked Spiderhunter
- Streaked Weaver
- Streaky Seedeater
- Striated Grassbird
- Striated Heron
- Stripe-headed Sparrow
- Stripe-throated Bulbul
- Striped Cuckoo
- Sultan Tit
- Summer Tanager
- Sunda Pygmy Woodpecker
- Sungrebe
- Superb Starling
- Superciliaried Hemispingus
- Surfbird
- Swainson's Hawk
- Swainson's Sparrow
- Swainson's Thrush
- Swamp Sparrow
- Sword-billed Hummingbird