- La Sagra's Flycatcher
- Laced Woodpecker
- Ladder-tailed Nightjar
- Lafresnaye's Vanga
- Lance-tailed Manakin
- Lappet-faced Vulture
- Large-billed Antwren
- Large-billed Crow
- Large-footed Finch
- Large Niltava
- Large Woodshrike
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Laughing Kookaburra
- Lava Gull
- Lava Heron
- Lavender Waxbill
- Lawes's Parotia
- Layard's Parakeet
- Least Bittern
- Least Grebe
- Least Sandpiper
- Legge's Flowerpecker
- Lemon-browed Flycatcher
- Lemon-rumped Tanager
- Lesser Adjutant
- Lesser Antillean Bullfinch
- Lesser Blue-eared Starling
- Lesser Coucal
- Lesser Crested Tern
- Lesser Elaenia
- Lesser Kestrel
- Lesser Kiskadee
- Lesser Scaup
- Lesser Spotted Woodpecker
- Lesser Striped Swallow
- Lesser Vasa Parrot
- Lesser Violetear
- Lesser Whistling Duck
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesser Yellownape
- Lesson's Motmot
- Levaillant's Cuckoo
- Lewin's Honeyeater
- Lilac-breasted Roller
- Limpkin
- Lineated Barbet
- Lineated Woodpecker
- Little Bee-eater
- Little Bittern
- Little Black Cormorant
- Little Blue Heron
- Little Corella
- Little Cormorant
- Little Egret
- Little Grebe
- Little Nightjar
- Little Pied Cormorant
- Little Ringed Plover
- Little Stint
- Little Tern
- Little Wattlebird
- Little Weaver
- Little Woodpecker
- Littoral Rock Thrush
- Loggerhead Kingbird
- Long-billed Bernieria
- Long-billed Corella
- Long-billed Crombec
- Long-billed Pipit
- Long-billed Starthroat
- Long-crested Eagle
- Long-eared Owl
- Long-tailed Broadbill
- Long-tailed Duck
- Long-tailed Fiscal
- Long-tailed Glossy Starling
- Long-tailed Ground Dove
- Long-tailed Ground Roller
- Long-tailed Hermit
- Long-tailed Mockingbird
- Long-tailed Potoo
- Long-tailed Shrike
- Long-tailed Silky-flycatcher
- Long-tailed Sylph
- Long-tailed Tit
- Long-tailed Tyrant
- Long-toed Lapwing
- Long-wattled Umbrellabird
- Long-winged Harrier
- Loria's Satinbird
- Loten's Sunbird
- Lowland Peltops
- Lyre-tailed Nightjar