- Laced Woodpecker
- Lacrimose Mountain Tanager
- Ladder-backed Woodpecker
- Ladder-tailed Nightjar
- Laggar Falcon
- Lanceolated Warbler
- Lanner Falcon
- Lapland Longspur
- Lappet-faced Vulture
- Large-billed Crow
- Large-billed Lark
- Large-billed Tern
- Large-headed Flatbill
- Large-tailed Nightjar
- Large Grey Babbler
- Large Niltava
- Large Scimitar Babbler
- Large Scrubwren
- Large Woodshrike
- Lark Bunting
- Lark Sparrow
- Latham's Snipe
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Laughing Kookaburra
- Laurel Pigeon
- Lavender Waxbill
- Lawrence's Goldfinch
- Lazuli Bunting
- Leach's Storm Petrel
- Leaf Lorikeet
- Lear's Macaw
- Least Auklet
- Least Boobook
- Least Grebe
- Least Honeyguide
- Least Sandpiper
- Least Seedsnipe
- Least Storm Petrel
- Least Tern
- Lemon-browed Flycatcher
- Lemon-rumped Tanager
- Lemon Dove
- Lesser Bird-of-paradise
- Lesser Black-backed Gull
- Lesser Coucal
- Lesser Crested Tern
- Lesser Cuckoo
- Lesser Flamingo
- Lesser Frigatebird
- Lesser Goldfinch
- Lesser Greenlet
- Lesser Grey Shrike
- Lesser Honeyguide
- Lesser Horned Owl
- Lesser Kestrel
- Lesser Kiskadee
- Lesser Masked Weaver
- Lesser Necklaced Laughingthrush
- Lesser Nighthawk
- Lesser Rhea
- Lesser Scaup
- Lesser Shortwing
- Lesser Spotted Eagle
- Lesser Spotted Woodpecker
- Lesser Striped Swallow
- Lesser Swallow-tailed Swift
- Lesser Swamp Warbler
- Lesser Whistling Duck
- Lesser White-fronted Goose
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesser Yellownape
- Lettered Aracari
- Levaillant's Cisticola
- Levaillant's Cuckoo
- Lewin's Honeyeater
- Lewis's Woodpecker
- Lichtenstein's Sandgrouse
- Lidth's Jay
- Light-vented Bulbul
- Lilac-breasted Roller
- Lincoln's Sparrow
- Line-cheeked Spinetail
- Lineated Barbet
- Lineated Woodpecker
- Lined Antshrike
- Lined Forest Falcon
- Little Auk
- Little Bee-eater
- Little Bittern
- Little Blue Heron
- Little Bronze Cuckoo
- Little Bunting
- Little Bustard
- Little Cormorant
- Little Crake
- Little Cuckoo
- Little Egret
- Little Forktail
- Little Grebe
- Little Green Pigeon
- Little Green Sunbird
- Little Green Woodpecker
- Little Greenbul
- Little Grey Flycatcher
- Little Grey Greenbul
- Little Gull
- Little Hermit
- Little Minivet
- Little Owl
- Little Penguin
- Little Pied Cormorant
- Little Pied Flycatcher
- Little Ringed Plover
- Little Rock Thrush
- Little Shearwater
- Little Sparrowhawk
- Little Stint
- Little Swift
- Little Tern
- Little Wood Rail
- Little Woodpecker
- Little Woodstar
- Lizard Buzzard
- Loggerhead Shrike
- Long-billed Corella
- Long-billed Crombec
- Long-billed Dowitcher
- Long-billed Honeyeater
- Long-billed Pipit
- Long-billed Plover
- Long-billed Starthroat
- Long-billed Thrasher
- Long-billed Thrush
- Long-billed Woodcreeper
- Long-crested Eagle
- Long-eared Owl
- Long-legged Buzzard
- Long-legged Pipit
- Long-tailed Broadbill
- Long-tailed Duck
- Long-tailed Fiscal
- Long-tailed Glossy Starling
- Long-tailed Hawk
- Long-tailed Honey Buzzard
- Long-tailed Jaeger
- Long-tailed Minivet
- Long-tailed Mockingbird
- Long-tailed Myna
- Long-tailed Nightjar
- Long-tailed Paradigalla
- Long-tailed Paradise Whydah
- Long-tailed Parakeet
- Long-tailed Potoo
- Long-tailed Shrike
- Long-tailed Sibia
- Long-tailed Starling
- Long-tailed Sylph
- Long-tailed Thrush
- Long-tailed Tit
- Long-tailed Triller
- Long-tailed Tyrant
- Long-tailed Widowbird
- Long-tailed Woodnymph
- Long-toed Lapwing
- Long-toed Stint
- Long-wattled Umbrellabird
- Longuemare's Sunangel
- Lorentz's Whistler
- Louisiade White-eye
- Lowland Peltops
- Lowland White-eye
- Lucy's Warbler
- Ludwig's Double-collared Sunbird
- Lyre-tailed Nightjar