- La Sagra's Flycatcher
- Lake Duck
- Lance-tailed Manakin
- Lappet-faced Vulture
- Large-billed Crow
- Large-billed Tern
- Large Grey Babbler
- Large Ground Finch
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Laughing Kookaburra
- Laurel Pigeon
- Lava Gull
- Lava Heron
- Leaden Flycatcher
- Least Grebe
- Least Sandpiper
- Least Seedsnipe
- Least Tern
- Lemon-bellied Flyrobin
- Lemon-rumped Tanager
- Lesser Adjutant
- Lesser Antillean Bullfinch
- Lesser Antillean Flycatcher
- Lesser Antillean Pewee
- Lesser Antillean Saltator
- Lesser Black-backed Gull
- Lesser Cuckoo
- Lesser Flamingo
- Lesser Goldfinch
- Lesser Grass Finch
- Lesser Grey Shrike
- Lesser Jacana
- Lesser Kestrel
- Lesser Kiskadee
- Lesser Masked Weaver
- Lesser Nighthawk
- Lesser Rhea
- Lesser Scaup
- Lesser Spotted Eagle
- Lesser Striped Swallow
- Lesser Violetear
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Motmot
- Lewin's Honeyeater
- Lichtenstein's Sandgrouse
- Lilac-breasted Roller
- Limpkin
- Lincoln's Sparrow
- Lineated Woodpecker
- Little Auk
- Little Bee-eater
- Little Bittern
- Little Black Cormorant
- Little Blue Heron
- Little Bustard
- Little Corella
- Little Cormorant
- Little Crake
- Little Crow
- Little Cuckoo-Dove
- Little Egret
- Little Friarbird
- Little Grebe
- Little Kingfisher
- Little Owl
- Little Pied Cormorant
- Little Raven
- Little Ringed Plover
- Little Rock Thrush
- Little Stint
- Little Wattlebird
- Lizard Buzzard
- Loggerhead Kingbird
- Loggerhead Shrike
- Long-billed Bernieria
- Long-billed Corella
- Long-billed Curlew
- Long-billed Starthroat
- Long-billed Thrasher
- Long-eared Owl
- Long-tailed Duck
- Long-tailed Fiscal
- Long-tailed Ground Roller
- Long-tailed Manakin
- Long-tailed Meadowlark
- Long-tailed Mockingbird
- Long-tailed Paradise Whydah
- Long-tailed Sylph
- Long-tailed Tit
- Long-tailed Triller
- Long-toed Lapwing
- Long-wattled Umbrellabird