- Lappet-faced Vulture
- Large-billed Gerygone
- Large-billed Tern
- Lark Sparrow
- Laughing Dove
- Laughing Falcon
- Laughing Gull
- Laughing Kookaburra
- Leaden Flycatcher
- Least Bittern
- Least Grebe
- Least Sandpiper
- Least Tern
- Lemon-bellied Flyrobin
- Lemon-chested Greenlet
- Lesser Crested Tern
- Lesser Flamingo
- Lesser Frigatebird
- Lesser Goldfinch
- Lesser Kiskadee
- Lesser Noddy
- Lesser Redpoll
- Lesser Striped Swallow
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Seedeater
- Lettered Aracari
- Levaillant's Cisticola
- Lilac-breasted Roller
- Limpkin
- Lineated Woodpecker
- Lined Forest Falcon
- Lined Seedeater
- Little Bee-eater
- Little Black Cormorant
- Little Blue Heron
- Little Bronze Cuckoo
- Little Chachalaca
- Little Corella
- Little Cormorant
- Little Cuckoo
- Little Eagle
- Little Egret
- Little Friarbird
- Little Grebe
- Little Penguin
- Little Pied Cormorant
- Little Tern
- Little Wattlebird
- Little Woodpecker
- Little Woodswallow
- Littoral Rock Thrush
- Loggerhead Shrike
- Long-billed Bernieria
- Long-billed Corella
- Long-billed Curlew
- Long-billed Pipit
- Long-tailed Finch
- Long-tailed Fiscal
- Long-tailed Ground Roller
- Long-tailed Hermit
- Long-tailed Potoo
- Long-tailed Tyrant
- Long-toed Lapwing
- Long-winged Harrier