- Ladder-tailed Nightjar
- Lappet-faced Vulture
- Large-billed Crow
- Large-billed Seed Finch
- Large-billed Tern
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Least Bittern
- Least Grebe
- Least Sandpiper
- Least Tern
- Lesser Adjutant
- Lesser Antillean Bullfinch
- Lesser Antillean Euphonia
- Lesser Antillean Flycatcher
- Lesser Antillean Pewee
- Lesser Antillean Saltator
- Lesser Black-backed Gull
- Lesser Crested Tern
- Lesser Elaenia
- Lesser Goldfinch
- Lesser Kiskadee
- Lesser Noddy
- Lesser Scaup
- Lesser Spotted Woodpecker
- Lesser Whistling Duck
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Motmot
- Lilac-breasted Roller
- Limpkin
- Lineated Barbet
- Lineated Woodpecker
- Lined Forest Falcon
- Lined Seedeater
- Little Bee-eater
- Little Bittern
- Little Blue Heron
- Little Chachalaca
- Little Cormorant
- Little Cuckoo
- Little Egret
- Little Grebe
- Little Hermit
- Little Stint
- Little Swift
- Little Tern
- Little Woodpecker
- Loggerhead Kingbird
- Long-billed Hermit
- Long-billed Woodcreeper
- Long-crested Eagle
- Long-legged Buzzard
- Long-tailed Hermit
- Long-tailed Meadowlark
- Long-tailed Tit
- Long-winged Antwren
- Long-winged Harrier
- Loten's Sunbird