- La Selle Thrush
- Lacrimose Mountain Tanager
- Lafresnaye's Vanga
- Laggar Falcon
- Lake Duck
- Lance-tailed Manakin
- Lanner Falcon
- Lapland Longspur
- Lappet-faced Vulture
- Large-billed Antwren
- Large-billed Crow
- Large-billed Lark
- Large-billed Scrubwren
- Large-billed Tern
- Large-footed Finch
- Large-tailed Nightjar
- Large Grey Babbler
- Large Ground Finch
- Large Niltava
- Large Scimitar Babbler
- Large Scrubwren
- Large Tree Finch
- Large Woodshrike
- Lark-like Brushrunner
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Laughing Kookaburra
- Lava Gull
- Layard's Warbler
- Least Grebe
- Least Honeyguide
- Least Poorwill
- Least Sandpiper
- Least Seedsnipe
- Lemon-bellied Flyrobin
- Lemon-bellied White-eye
- Lemon-breasted Canary
- Lemon-browed Flycatcher
- Lemon-rumped Warbler
- Lesser Adjutant
- Lesser Antillean Pewee
- Lesser Bird-of-paradise
- Lesser Black-backed Gull
- Lesser Coucal
- Lesser Elaenia
- Lesser Fish Eagle
- Lesser Flamingo
- Lesser Frigatebird
- Lesser Goldfinch
- Lesser Greenlet
- Lesser Grey Shrike
- Lesser Ground Robin
- Lesser Horned Owl
- Lesser Kestrel
- Lesser Kiskadee
- Lesser Masked Weaver
- Lesser Melampitta
- Lesser Necklaced Laughingthrush
- Lesser Racket-tailed Drongo
- Lesser Redpoll
- Lesser Rhea
- Lesser Shrike-Tyrant
- Lesser Spotted Woodpecker
- Lesser Striped Swallow
- Lesser Swamp Warbler
- Lesser Vasa Parrot
- Lesser Violetear
- Lesser Whistling Duck
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesser Yellownape
- Letter-winged Kite
- Levaillant's Cisticola
- Levaillant's Cuckoo
- Lichtenstein's Sandgrouse
- Lilac-breasted Roller
- Limpkin
- Lineated Barbet
- Lineated Foliage-gleaner
- Lined Quail-Dove
- Little Bee-eater
- Little Bittern
- Little Black Cormorant
- Little Blue Heron
- Little Bronze Cuckoo
- Little Bunting
- Little Bustard
- Little Corella
- Little Cormorant
- Little Crake
- Little Crow
- Little Cuckoo
- Little Eagle
- Little Egret
- Little Friarbird
- Little Grassbird
- Little Grebe
- Little Greenbul
- Little Grey Greenbul
- Little Gull
- Little Owl
- Little Penguin
- Little Pied Cormorant
- Little Pied Flycatcher
- Little Raven
- Little Ringed Plover
- Little Rush Warbler
- Little Shearwater
- Little Spiderhunter
- Little Stint
- Little Swift
- Little Tern
- Little Thornbird
- Little Wattlebird
- Little Weaver
- Livingstone's Turaco
- Lizard Buzzard
- Loggerhead Kingbird
- Long-billed Bernieria
- Long-billed Corella
- Long-billed Crombec
- Long-billed Crow
- Long-billed Cuckoo
- Long-billed Hermit
- Long-billed Honeyeater
- Long-billed Pipit
- Long-billed Plover
- Long-billed Starthroat
- Long-billed Wren-Babbler
- Long-crested Eagle
- Long-eared Owl
- Long-legged Buzzard
- Long-tailed Broadbill
- Long-tailed Duck
- Long-tailed Ground Roller
- Long-tailed Hawk
- Long-tailed Honey Buzzard
- Long-tailed Jaeger
- Long-tailed Meadowlark
- Long-tailed Minivet
- Long-tailed Myna
- Long-tailed Shrike
- Long-tailed Sibia
- Long-tailed Silky-flycatcher
- Long-tailed Starling
- Long-tailed Sylph
- Long-tailed Tit
- Long-tailed Tyrant
- Long-tailed Widowbird
- Long-toed Lapwing
- Long-toed Stint
- Long-winged Harrier
- Lowland Peltops
- Lowland White-eye
- Lühder's Bushshrike
- Luzon Boobook
- Luzon Flameback
- Luzon Hornbill
- Lyre-tailed Nightjar