- Sabota Lark
- Saffron-crowned Tanager
- Saffron Finch
- Saffron Siskin
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Savanna Hawk
- Savi's Warbler
- Scale-crested Pygmy Tyrant
- Scaly-feathered Weaver
- Scaly-throated Foliage-gleaner
- Scarlet-backed Woodpecker
- Scarlet-bellied Mountain Tanager
- Scarlet Flycatcher
- Scarlet Ibis
- Scarlet Macaw
- Scopoli's Shearwater
- Screaming Piha
- Scrub Blackbird
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Sepia-capped Flycatcher
- Shaft-tailed Whydah
- Sharp-shinned Hawk
- Shikra
- Shining Sunbeam
- Shiny Cowbird
- Short-billed Dowitcher
- Short-billed Leaftosser
- Short-crested Flycatcher
- Short-eared Owl
- Short-tailed Field Tyrant
- Short-tailed Hawk
- Short-tailed Nighthawk
- Short-tailed Parrot
- Short-tailed Pygmy Tyrant
- Short-tailed Swift
- Short-tailed Woodstar
- Short-toed Rock Thrush
- Short-toed Treecreeper
- Siberian Jay
- Sibilant Sirystes
- Sierran Elaenia
- Silver-backed Tanager
- Silver-beaked Tanager
- Silver-throated Tanager
- Silvered Antbird
- Silvery Grebe
- Slate-colored Grosbeak
- Slate-colored Hawk
- Slate-colored Seedeater
- Slate-throated Whitestart
- Slaty-backed Forest Falcon
- Slaty-capped Flycatcher
- Slaty-capped Shrike-Vireo
- Slaty Becard
- Slender-billed Gull
- Slender-billed Kite
- Slender-billed Xenops
- Small-billed Elaenia
- Smew
- Smoke-colored Pewee
- Smoky-brown Woodpecker
- Smoky-fronted Tody-Flycatcher
- Smooth-billed Ani
- Snail Kite
- Snowy-throated Kingbird
- Snowy Egret
- Snowy Plover
- Sociable Weaver
- Social Flycatcher
- Solitary Sandpiper
- Song Thrush
- Sooty Barbthroat
- Sooty Tern
- South African Shelduck
- Southern Beardless Tyrannulet
- Southern Fiscal
- Southern Grey-headed Sparrow
- Southern Martin
- Southern Masked Weaver
- Southern Mealy Amazon
- Southern Red-billed Hornbill
- Southern Rough-winged Swallow
- Southern White-crowned Shrike
- Southern White-fringed Antwren
- Southern Yellow-billed Hornbill
- Spangled Cotinga
- Sparkling Violetear
- Speckled Chachalaca
- Speckled Hummingbird
- Speckled Pigeon
- Speckled Spinetail
- Spectacled Owl
- Spectacled Thrush
- Spectacled Whitestart
- Spike-heeled Lark
- Spot-backed Antbird
- Spot-breasted Woodpecker
- Spot-tailed Antwren
- Spot-tailed Nightjar
- Spot-throated Woodcreeper
- Spot-winged Antbird
- Spotted Antpitta
- Spotted Barbtail
- Spotted Flycatcher
- Spotted Puffbird
- Spotted Sandpiper
- Spotted Tanager
- Spotted Tody-Flycatcher
- Spotted Woodcreeper
- Spur-winged Goose
- Squirrel Cuckoo
- Stilt Sandpiper
- Stout-billed Cinclodes
- Straight-billed Hermit
- Straight-billed Woodcreeper
- Streak-headed Woodcreeper
- Streak-necked Flycatcher
- Streaked Flycatcher
- Streaked Saltator
- Streaked Tuftedcheek
- Streaked Xenops
- Striated Heron
- Striped Cuckoo
- Striped Kingfisher
- Striped Owl
- Subtropical Cacique
- Sulphur-rumped Myiobius
- Sulphury Flycatcher
- Summer Tanager
- Sungrebe
- Superciliaried Hemispingus
- Superciliated Wren
- Surfbird
- Swainson's Thrush
- Swallow-tailed Bee-eater
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swallow Tanager