- Lance-tailed Manakin
- Lanceolated Monklet
- Lanner Falcon
- Lappet-faced Vulture
- Large-billed Seed Finch
- Large-billed Tern
- Large Cuckooshrike
- Laughing Falcon
- Layard's Parakeet
- Least Sandpiper
- Lemon-rumped Tanager
- Lesser Adjutant
- Lesser Coucal
- Lesser Fish Eagle
- Lesser Goldfinch
- Lesser Kiskadee
- Lesser Nighthawk
- Lesser Spotted Eagle
- Lesser Striped Swallow
- Lesser Whistling Duck
- Lesser Yellow-headed Vulture
- Lesser Yellownape
- Lesson's Motmot
- Levaillant's Cuckoo
- Lilac-breasted Roller
- Limpkin
- Lineated Barbet
- Lineated Woodpecker
- Little Bee-eater
- Little Blue Heron
- Little Cormorant
- Little Egret
- Little Grebe
- Little Ringed Plover
- Little Sparrowhawk
- Little Tinamou
- Little Woodpecker
- Lizard Buzzard
- Long-billed Bernieria
- Long-billed Hermit
- Long-billed Starthroat
- Long-eared Owl
- Long-legged Buzzard
- Long-tailed Duck
- Long-tailed Fiscal
- Long-tailed Ground Roller
- Long-tailed Paradise Whydah
- Long-tailed Shrike
- Long-tailed Sylph
- Long-tailed Tit
- Long-toed Lapwing
- Louisiana Waterthrush
- Lyre-tailed Nightjar