- Laced Woodpecker
- Lafresnaye's Vanga
- Lake Duck
- Lance-tailed Manakin
- Lapland Longspur
- Lappet-faced Vulture
- Large-billed Crow
- Large-billed Lark
- Large Grey Babbler
- Large Niltava
- Large Rock Martin
- Laughing Dove
- Laughing Gull
- Lava Gull
- Lava Heron
- Lavender Waxbill
- Least Sandpiper
- Least Seedsnipe
- Lemon Dove
- Lesser Adjutant
- Lesser Antillean Bullfinch
- Lesser Antillean Pewee
- Lesser Antillean Saltator
- Lesser Black-backed Gull
- Lesser Coucal
- Lesser Flamingo
- Lesser Rhea
- Lesser Scaup
- Lesser Striped Swallow
- Lesser Swamp Warbler
- Lesser Whistling Duck
- Lesser Whitethroat
- Lesser Yellowlegs
- Lesson's Motmot
- Levaillant's Cisticola
- Lilac-breasted Roller
- Limpkin
- Lineated Barbet
- Lineated Woodpecker
- Little Auk
- Little Bee-eater
- Little Blue Heron
- Little Cormorant
- Little Cuckoo-Dove
- Little Egret
- Little Grebe
- Little Gull
- Little Owl
- Little Pied Cormorant
- Little Pied Flycatcher
- Little Ringed Plover
- Little Rock Thrush
- Little Stint
- Little Tern
- Lizard Buzzard
- Loggerhead Kingbird
- Long-crested Eagle
- Long-eared Owl
- Long-legged Buzzard
- Long-tailed Broadbill
- Long-tailed Duck
- Long-tailed Glossy Starling
- Long-tailed Ground Roller
- Long-tailed Manakin
- Long-tailed Meadowlark
- Long-tailed Mockingbird
- Long-tailed Nightjar
- Long-tailed Paradise Whydah
- Long-tailed Parakeet
- Long-tailed Shrike
- Long-tailed Silky-flycatcher
- Long-tailed Tit
- Loten's Sunbird