Slender-billed inezia 
Slender-footed Tyrannulet 
Small-billed elaenia 
Smoke-colored pewee 
Smoky bush tyrant 
Snowy-throated kingbird 
Social flycatcher 
Sooty-headed tyrannulet 
Southern beardless tyrannulet 
Southern bentbill 
Southern scrub flycatcher 
Spectacled Tyrannulet 
Spectacled tyrant 
Spot-billed ground tyrant 
Spotted Tody-flycatcher 
Streak-necked flycatcher 
Streak-throated bush tyrant 
Streaked flycatcher 
Streamer-tailed tyrant 
Stripe-necked tody-tyrant 
Stub-tailed spadebill 
Subtropical doradito 
Sulphur-bellied flycatcher 
Sulphur-bellied tyrannulet