- Lacrimose Mountain Tanager
- Ladder-tailed Nightjar
- Lafresnaye's Piculet
- Lanceolated Monklet
- Lanner Falcon
- Lapland Longspur
- Lappet-faced Vulture
- Large-billed Lark
- Large-billed Seed Finch
- Large-billed Tern
- Large Rock Martin
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Leach's Storm Petrel
- Least Bittern
- Least Grebe
- Least Sandpiper
- Lemon-chested Greenlet
- Lesser Antillean Bullfinch
- Lesser Antillean Swift
- Lesser Black-backed Gull
- Lesser Elaenia
- Lesser Flamingo
- Lesser Honeyguide
- Lesser Kiskadee
- Lesser Masked Weaver
- Lesser Nighthawk
- Lesser Scaup
- Lesser Spotted Woodpecker
- Lesser Striped Swallow
- Lesser Swallow-tailed Swift
- Lesser Violetear
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Seedeater
- Lettered Aracari
- Levaillant's Cisticola
- Lilac-breasted Roller
- Lilac-tailed Parrotlet
- Limpkin
- Line-cheeked Spinetail
- Lineated Woodpecker
- Lined Forest Falcon
- Lined Seedeater
- Little Bee-eater
- Little Blue Heron
- Little Chachalaca
- Little Cuckoo
- Little Egret
- Little Grebe
- Little Gull
- Little Hermit
- Little Owl
- Little Ringed Plover
- Little Stint
- Little Tern
- Little Woodpecker
- Livingstone's Turaco
- Lizard Buzzard
- Long-billed Crombec
- Long-billed Starthroat
- Long-billed Woodcreeper
- Long-crested Eagle
- Long-eared Owl
- Long-legged Buzzard
- Long-tailed Hermit
- Long-tailed Jaeger
- Long-tailed Mockingbird
- Long-tailed Potoo
- Long-tailed Tit
- Long-tailed Tyrant
- Long-wattled Umbrellabird
- Long-winged Antwren
- Long-winged Harrier
- Ludwig's Bustard