- Sand Martin
- Sanderling
- Savanna Hawk
- Scarlet Ibis
- Screaming Piha
- Semipalmated Sandpiper
- Shiny Cowbird
- Short-billed Dowitcher
- Short-crested Flycatcher
- Short-tailed Hawk
- Short-tailed Parrot
- Short-tailed Pygmy Tyrant
- Silver-beaked Tanager
- Silvered Antbird
- Slender-billed Kite
- Smoky-fronted Tody-Flycatcher
- Smooth-billed Ani
- Snail Kite
- Snowy Egret
- Solitary Sandpiper
- Southern Beardless Tyrannulet
- Southern House Wren
- Southern Lapwing
- Southern Mouse-colored Tyrannulet
- Southern White-fringed Antwren
- Spectacled Owl
- Spectacled Thrush
- Spot-breasted Woodpecker
- Spot-tailed Nightjar
- Spot-winged Antbird
- Spotted Puffbird
- Spotted Rail
- Spotted Sandpiper
- Spotted Tody-Flycatcher
- Squirrel Cuckoo
- Stilt Sandpiper
- Straight-billed Woodcreeper
- Streaked Flycatcher
- Striated Heron
- Striped Cuckoo
- Striped Owl
- Summer Tanager
- Swallow-tailed Kite
- Swallow-winged Puffbird