- Laughing Falcon
- Laughing Gull
- Least Bittern
- Least Grebe
- Least Sandpiper
- Least Tern
- Lemon-chested Greenlet
- Lesser Kiskadee
- Lesser Swallow-tailed Swift
- Lesser Yellow-headed Vulture
- Lilac-tailed Parrotlet
- Limpkin
- Lineated Woodpecker
- Lined Seedeater
- Little Blue Heron
- Little Chachalaca
- Little Cuckoo
- Little Hermit
- Little Tinamou
- Little Wood Rail
- Little Woodpecker
- Long-tailed Hermit
- Long-tailed Tyrant
- Long-winged Harrier