- Sabota Lark
- Saddle-billed Stork
- Saffron Finch
- Sanderling
- Sandwich Tern
- Sardinian Warbler
- Scaly-throated Foliage-gleaner
- Scarlet-bellied Mountain Tanager
- Scarlet-rumped Tanager
- Scarlet-thighed Dacnis
- Scarlet Macaw
- Scintillant Hummingbird
- Scissor-tailed Flycatcher
- Sclater's Crowned Pigeon
- Scrub Tanager
- Secretarybird
- Semipalmated Plover
- Shining Sunbeam
- Shiny Cowbird
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Sickle-winged Chat
- Sickle-winged Guan
- Silver-throated Tanager
- Silver Gull
- Silvered Antbird
- Slate-throated Whitestart
- Slaty-backed Chat-Tyrant
- Slaty-crowned Antpitta
- Slaty-tailed Trogon
- Slaty Brushfinch
- Slaty Flowerpiercer
- Small Ground Finch
- Smew
- Smooth-billed Ani
- Snowy Egret
- Solitary Sandpiper
- Song Thrush
- Sooty Thrush
- Southern Fiscal
- Southern Grey-headed Sparrow
- Southern Ground Hornbill
- Southern House Wren
- Southern Lapwing
- Southern Pied Babbler
- Southern Pochard
- Southern Red-billed Hornbill
- Southern White-faced Owl
- Southern Yellow-billed Hornbill
- Sparkling Violetear
- Speckled Chachalaca
- Speckled Hummingbird
- Speckled Pigeon
- Spectacled Parrotlet
- Spectacled Weaver
- Spillmann's Tapaculo
- Spot-crowned Barbet
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Spotted Woodcreeper
- Spur-winged Goose
- Squacco Heron
- Squirrel Cuckoo
- Steely-vented Hummingbird
- Stout-billed Cinclodes
- Streak-headed Woodcreeper
- Streaked Flycatcher
- Streaked Saltator
- Streaky-headed Seedeater
- Striolated Manakin
- Stripe-headed Sparrow
- Stripe-tailed Hummingbird
- Striped Treehunter
- Subtropical Cacique
- Sulphur-crested Cockatoo
- Sulphur-winged Parakeet
- Summer Tanager
- Sunbittern
- Sunda Zebra Finch
- Sungrebe
- Superb Fairywren
- Superciliaried Hemispingus
- Swainson's Spurfowl
- Swainson's Thrush
- Swallow-tailed Gull
- Swee Waxbill
- Sword-billed Hummingbird