- Ladder-tailed Nightjar
- Lance-tailed Manakin
- Large-billed Crow
- Large-billed Lark
- Large-billed Tern
- Large Fig Parrot
- Large Scrubwren
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Lavender Waxbill
- Layard's Parakeet
- Layard's Warbler
- Lazuline Sabrewing
- Least Flycatcher
- Least Grebe
- Least Sandpiper
- Legge's Flowerpecker
- Lemon-rumped Tanager
- Lesser Adjutant
- Lesser Bird-of-paradise
- Lesser Black-backed Gull
- Lesser Flamingo
- Lesser Frigatebird
- Lesser Goldfinch
- Lesser Grey Shrike
- Lesser Honeyguide
- Lesser Kestrel
- Lesser Kiskadee
- Lesser Moorhen
- Lesser Nighthawk
- Lesser Redpoll
- Lesser Scaup
- Lesser Spotted Eagle
- Lesser Spotted Woodpecker
- Lesser Striped Swallow
- Lesser Violetear
- Lesser Whistling Duck
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesser Yellownape
- Lesson's Motmot
- Levaillant's Cisticola
- Levaillant's Cuckoo
- Levant Sparrowhawk
- Limpkin
- Lincoln's Sparrow
- Lineated Barbet
- Lineated Foliage-gleaner
- Lineated Woodpecker
- Lined Seedeater
- Little Bee-eater
- Little Bittern
- Little Blue Heron
- Little Bronze Cuckoo
- Little Bunting
- Little Bustard
- Little Cormorant
- Little Crake
- Little Cuckoo
- Little Egret
- Little Grebe
- Little Grey Flycatcher
- Little Gull
- Little Ringed Plover
- Little Rush Warbler
- Little Stint
- Little Swift
- Little Tern
- Little Weaver
- Lizard Buzzard
- Long-billed Crombec
- Long-billed Dowitcher
- Long-billed Hermit
- Long-billed Starthroat
- Long-billed Woodcreeper
- Long-eared Owl
- Long-legged Buzzard
- Long-tailed Glossy Starling
- Long-tailed Hawk
- Long-tailed Honey Buzzard
- Long-tailed Jaeger
- Long-tailed Mockingbird
- Long-tailed Nightjar
- Long-tailed Silky-flycatcher
- Long-tailed Sylph
- Long-tailed Tit
- Long-tailed Tyrant
- Long-wattled Umbrellabird
- Ludwig's Bustard
- Lyre-tailed Nightjar