- Laced Woodpecker
- Lacrimose Mountain Tanager
- Lance-tailed Manakin
- Lapland Longspur
- Large-tailed Nightjar
- Large Scimitar Babbler
- Lark Sparrow
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Lazuline Sabrewing
- Least Bittern
- Least Flycatcher
- Least Sandpiper
- Least Tern
- Lesser Antillean Bullfinch
- Lesser Antillean Pewee
- Lesser Antillean Saltator
- Lesser Black-backed Gull
- Lesser Crested Tern
- Lesser Flamingo
- Lesser Goldfinch
- Lesser Greenlet
- Lesser Kestrel
- Lesser Moorhen
- Lesser Necklaced Laughingthrush
- Lesser Racket-tailed Drongo
- Lesser Scaup
- Lesser Spotted Woodpecker
- Lesser Violetear
- Lesser Whistling Duck
- Lesser Whitethroat
- Lesser Whitethroat (minula)
- Lesser Yellowlegs
- Lesson's Motmot
- Lewis's Woodpecker
- Lilac-crowned Amazon
- Limpkin
- Lincoln's Sparrow
- Lineated Barbet
- Lineated Woodpecker
- Little Bee-eater
- Little Bittern
- Little Blue Heron
- Little Bustard
- Little Cormorant
- Little Crake
- Little Cuckoo-Dove
- Little Egret
- Little Grebe
- Little Gull
- Little Owl
- Little Pied Flycatcher
- Little Ringed Plover
- Little Spiderhunter
- Little Stint
- Little Tern
- Little Woodpecker
- Loggerhead Shrike
- Long-billed Curlew
- Long-billed Dowitcher
- Long-billed Hermit
- Long-crested Eagle
- Long-eared Owl
- Long-legged Buzzard
- Long-tailed Broadbill
- Long-tailed Duck
- Long-tailed Jaeger
- Long-tailed Sibia
- Long-tailed Silky-flycatcher
- Long-tailed Sylph
- Long-tailed Tit
- Long-toed Stint