- Lark
- Loon
- Lapwing
- Lorikeet
- Lyrebird
- Lovebird
- Long-tailed Tit
- Laughing Dove
- Little Egret
- Limpkin
- Lark Bunting
- LeConte’s Sparrow
- Lazuli Bunting
- Least Bittern
- Loggerhead Shrike
- Long-billed Dowitcher
- Little Blue Heron
- Lesser Scaup
- Least Flycatcher
- Laughing Kookaburra
- Lesser Goldfinch
- Little Grebe
- Little Gull
- Lesser Flamingo
- Lilac-breasted Roller
- Levaillant’s Cuckoo
- Luzon Hornbill
- Lemon-throated Warbler
- Luzon Bleeding-heart
- Lilian’s Lovebird
- Luzon Water Redstart
- Large-billed Tern
- Little Pied Cormorant
- Lesser Yellowlegs
- Long-tailed Duck
- Large-billed Crow
- Lesser Prairie Chicken
- Least Tern
- Long-billed Thrasher
- Least Grebe
- Long-tailed Manakin
- Laysan Albatross
- Lesser Whitethroat
- Little Ringed Plover
- Levaillant’s Barbet
- Least Storm Petrel
- Little Tern
- Least Sandpiper
- Lesser Black-backed Gull
- Little Woodpecker
- Lark Sparrow
- Loggerhead Kingbird
- Large-billed Seed Finch
- Long-tailed Broadbill
- Large-billed Lark
- Least Bittern
- Lesser Antillean Bullfinch
- Louisiana Waterthrush
- Laughing Falcon
- Lemon-bellied Flycatcher
- Lesser Sooty Owl
- Least Auklet
- LeConte’s Thrasher
- Lilac-crowned Amazon
- Little Corella
- Little Bronze Cuckoo
- Large Woodshrike
- Long-toed Lapwing
- Lesser Kestrel
- Long-billed Crombec
- Large Cuckooshrike
- Little Spiderhunter
- Little Blue Heron
- Lesser Yellow-naped Woodpecker
- Long-billed Plover
- Lark-like Brushrunner
- Lesser Black-backed Gull
- Lilac-breasted Roller
- Least Sandpiper
- Laughing Kookaburra
- Least Flycatcher
- Little Grebe
- Loggerhead Shrike
- Long-billed Dowitcher
- Least Bittern
- Lazuli Bunting
- LeConte’s Sparrow
- Lark Bunting
- Little Egret
- Laughing Dove
- Long-tailed Tit
- Lovebird
- Lyrebird
- Lark
- Loon
- Lapwing
- Lorikeet
- Lyrebird
- Lovebird
- Long-tailed Tit
- Laughing Dove
- Little Egret
- Limpkin
- Lark Bunting
- LeConte’s Sparrow
- Lazuli Bunting
- Least Bittern
- Loggerhead Shrike
- Long-billed Dowitcher
- Little Blue Heron
- Lesser Scaup
- Least Flycatcher
- Laughing Kookaburra
- Lesser Goldfinch
- Little Grebe
- Little Gull
- Lesser Flamingo
- Lilac-breasted Roller
- Levaillant’s Cuckoo
- Luzon Hornbill
- Lemon-throated Warbler
- Luzon Bleeding-heart
- Lilian’s Lovebird
- Luzon Water Redstart
- Large-billed Tern
- Little Pied Cormorant
- Lesser Yellowlegs
- Long-tailed Duck
- Large-billed Crow
- Lesser Prairie Chicken
- Least Tern
- Long-billed Thrasher
- Least Grebe
- Long-tailed Manakin
- Laysan Albatross
- Lesser Whitethroat
- Little Ringed Plover
- Levaillant’s Barbet
- Least Storm Petrel
- Little Tern
- Least Sandpiper
- Lesser Black-backed Gull
- Little Woodpecker
- Lark Sparrow
- Loggerhead Kingbird
- Large-billed Seed Finch
- Long-tailed Broadbill
- Large-billed Lark
- Least Bittern
- Lesser Antillean Bullfinch
