- Sabota Lark
- Sanderling
- Sardinian Warbler
- Savanna Hawk
- Savi's Warbler
- Scaly-feathered Weaver
- Scarlet Ibis
- Scopoli's Shearwater
- Screaming Piha
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Semipalmated Sandpiper
- Sepia-capped Flycatcher
- Shaft-tailed Whydah
- Shikra
- Shiny Cowbird
- Short-billed Dowitcher
- Short-billed Leaftosser
- Short-crested Flycatcher
- Short-eared Owl
- Short-tailed Hawk
- Short-tailed Nighthawk
- Short-tailed Parrot
- Short-tailed Pygmy Tyrant
- Short-tailed Swift
- Short-toed Rock Thrush
- Short-toed Treecreeper
- Siberian Jay
- Silver-beaked Tanager
- Silvered Antbird
- Slate-colored Grosbeak
- Slate-colored Hawk
- Slate-colored Seedeater
- Slaty-backed Forest Falcon
- Slender-billed Gull
- Slender-billed Kite
- Small-billed Elaenia
- Smew
- Smoky-fronted Tody-Flycatcher
- Smooth-billed Ani
- Snail Kite
- Snowy Egret
- Sociable Weaver
- 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 Red-billed Hornbill
- Southern White-crowned Shrike
- Southern White-fringed Antwren
- Southern Yellow-billed Hornbill
- Spangled Cotinga
- Speckled Pigeon
- Speckled Spinetail
- Spectacled Owl
- Spectacled Thrush
- Spike-heeled Lark
- Spot-backed Antbird
- Spot-breasted Woodpecker
- Spot-tailed Antwren
- Spot-tailed Nightjar
- Spot-throated Woodcreeper
- Spot-winged Antbird
- Spotted Antpitta
- Spotted Flycatcher
- Spotted Puffbird
- Spotted Sandpiper
- Spotted Tanager
- Spotted Tody-Flycatcher
- Spur-winged Goose
- Squirrel Cuckoo
- Stilt Sandpiper
- Straight-billed Hermit
- Straight-billed Woodcreeper
- Streaked Flycatcher
- Striated Heron
- Striped Cuckoo
- Striped Kingfisher
- Striped Owl
- Subalpine Warbler
- Sulphury Flycatcher
- Summer Tanager
- Sungrebe
- Swallow-tailed Bee-eater
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swallow Tanager