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