- Lacrimose Mountain Tanager
- Large-billed Antwren
- Large-billed Tern
- Laughing Dove
- Laughing Falcon
- Lavender Waxbill
- Lemon-rumped Tanager
- Lesser Elaenia
- Lesser Flamingo
- Lesser Goldfinch
- Lesser Greenlet
- Lesser Kiskadee
- Lesser Spotted Woodpecker
- Lesser Striped Swallow
- Lesser Swamp Warbler
- Lesser Violetear
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Motmot
- Lettered Aracari
- Lilac-breasted Roller
- Limpkin
- Lineated Foliage-gleaner
- Lineated Woodpecker
- Little Bee-eater
- Little Bittern
- Little Blue Heron
- Little Egret
- Little Grebe
- Little Heron
- Little Nightjar
- Little Owl
- Little Ringed Plover
- Little Spotted Woodpecker
- Little Stint
- Little Swift
- Little Weaver
- Little Woodpecker
- Lizard Buzzard
- Long-crested Eagle
- Long-eared Owl
- Long-tailed Glossy Starling
- Long-tailed Ground Dove
- Long-tailed Manakin
- Long-tailed Nightjar
- Long-tailed Silky-flycatcher
- Long-tailed Sylph
- Long-tailed Tit
- Long-toed Lapwing
- Longuemare's Sunangel
- Lühder's Bushshrike