- Laughing Falcon
- Laughing Gull
- Least Bittern
- Least Grebe
- Least Sandpiper
- Least Tern
- Lesser Elaenia
- Lesser Kiskadee
- Lesser Nighthawk
- Lesser Scaup
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Seedeater
- Limpkin
- Lineated Woodpecker
- Lined Seedeater
- Little Bittern
- Little Blue Heron
- Little Chachalaca
- Little Cuckoo
- Little Egret
- Little Hermit
- Little Woodpecker
- Long-tailed Hermit
- Long-winged Harrier