- Saffron Finch
- Sanderling
- Sandwich Tern
- Savanna Hawk
- Sayaca Tanager
- Scale-throated Hermit
- Scaled Dove
- Scaled Pigeon
- Scaly-headed Parrot
- Scarlet Flycatcher
- Scarlet Ibis
- Scarlet Macaw
- Screaming Piha
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Sepia-capped Flycatcher
- Shiny Cowbird
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-tailed Hawk
- Short-tailed Parrot
- Short-tailed Swift
- Silver-beaked Tanager
- Silvered Antbird
- Slaty-breasted Wood Rail
- Slender-billed Weaver
- Smooth-billed Ani
- Snail Kite
- Snowy Egret
- Social Flycatcher
- Solitary Cacique
- Solitary Sandpiper
- Sombre Hummingbird
- Sooty Barbthroat
- Sooty Chat
- Sooty Tern
- Southern Beardless Tyrannulet
- Southern Lapwing
- Southern Martin
- Southern Mouse-colored Tyrannulet
- Southern Rough-winged Swallow
- Southern Screamer
- Southern White-fringed Antwren
- Spangled Cotinga
- Speckled Mousebird
- Speckled Spinetail
- Speckled Tanager
- Spectacled Thrush
- Spot-breasted Woodpecker
- Spot-winged Antbird
- Spotted Flycatcher
- Spotted Puffbird
- Spotted Sandpiper
- Spotted Tanager
- Spotted Tody-Flycatcher
- Squirrel Cuckoo
- Straight-billed Hermit
- Straight-billed Woodcreeper
- Streaked Flycatcher
- Striated Heron
- Stripe-necked Tody-Tyrant
- Striped Cuckoo
- Striped Owl
- Sulphur-breasted Parakeet
- Sulphury Flycatcher
- Summer Tanager
- Sunbittern
- Sungrebe
- Surucua Trogon
- Swainson's Flycatcher
- Swallow-tailed Hummingbird
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swan Goose