- Saddle-billed Stork
- Savanna Hawk
- Scarlet Ibis
- Scarlet Macaw
- Screaming Piha
- Secretarybird
- Semipalmated Plover
- Semipalmated Sandpiper
- Shiny Cowbird
- Short-crested Flycatcher
- Short-tailed Hawk
- Short-tailed Parrot
- Short-tailed Swift
- Silver-beaked Tanager
- Slate-colored Grosbeak
- Slender-tailed Nightjar
- Smoky-fronted Tody-Flycatcher
- Smooth-billed Ani
- Snowy Egret
- Sooty Chat
- Sooty Tern
- South American Snipe
- Southern Ground Hornbill
- Southern Martin
- Southern Mealy Amazon
- Southern White-fringed Antwren
- Spangled Cotinga
- Speckled Mousebird
- Spectacled Owl
- Spectacled Thrush
- Spot-breasted Woodpecker
- Spotted Tanager
- Spotted Thick-knee
- Spotted Tody-Flycatcher
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Squirrel Cuckoo
- Straight-billed Woodcreeper
- Streaked Flycatcher
- Striated Heron
- Striped Cuckoo
- Summer Tanager
- Superb Starling
- Swallow-tailed Kite
- Swallow-winged Puffbird