- Lagden's Bushshrike
- Lanceolated Monklet
- Large Tree Finch
- Laughing Kookaburra
- Laughing Owl
- Lava Gull
- Laysan Albatross
- Laysan Duck
- Laysan Finch
- Lazuli Kingfisher
- Leach's Storm Petrel
- Least Storm Petrel
- Lemon-throated Barbet
- Lesser Blue-eared Starling
- Lesser Crested Tern
- Lesser Moorhen
- Lesser Noddy
- Lesser Yellow-headed Vulture
- Lewin's Rail
- Light-mantled Albatross
- Lilian's Lovebird
- Lineated Barbet
- Little Buttonquail
- Little Curlew
- Little Kingfisher
- Little Paradise Kingfisher
- Little Spotted Kiwi
- Long-billed Thrush
- Long-legged Buzzard
- Long-tailed Glossy Starling
- Long-tailed Ground Roller
- Long-tailed Hawk
- Long-tailed Thrush
- Long-toed Lapwing
- Loria's Satinbird
- Loten's Sunbird
- Lovely Sunbird