- Lapland Longspur
- Lappet-faced Vulture
- Laughing Dove
- Laughing Gull
- Laughing Kookaburra
- Leach's Storm Petrel
- Least Sandpiper
- Lemon-bellied Crombec
- Lesser Black-backed Gull
- Lesser Spotted Eagle
- Lesser Striped Swallow
- Light-mantled Albatross
- Lilac-breasted Roller
- Limpkin
- Little Auk
- Little Bunting
- Little Green Woodpecker
- Little Greenbul
- Little Grey Flycatcher
- Little Owl
- Little Penguin
- Little Pied Cormorant
- Little Raven
- Little Swift
- Little Wattlebird
- Little Woodswallow
- Loango Weaver
- Long-billed Corella
- Long-billed Pipit
- Long-legged Pipit
- Long-tailed Jaeger
- Lowland Akalat