- Laggar Falcon
- Lanner Falcon
- Lapland Longspur
- Large-tailed Nightjar
- Large Fig Parrot
- Large Hawk-Cuckoo
- Large Niltava
- Lattice-tailed Trogon
- Laughing Gull
- Laughing Owl
- Layard's Parakeet
- Legge's Flowerpecker
- Lesser Black-backed Gull
- Lesser Florican
- Lesser Goldfinch
- Lesser Green Leafbird
- Lesser Grey Shrike
- Lesser Kestrel
- Lesser Melampitta
- Lesser Spotted Eagle
- Lesser Spotted Woodpecker
- Letter-winged Kite
- Lettered Aracari
- Light-vented Bulbul
- Little Auk
- Little Bittern
- Little Black Cormorant
- Little Bustard
- Little Corella
- Little Cormorant
- Little Crake
- Little Eagle
- Little Egret
- Little Forktail
- Little Grebe
- Little Gull
- Little Hermit
- Little Owl
- Little Pied Cormorant
- Little Ringed Plover
- Little Shearwater
- Little Spotted Kiwi
- Little Stint
- Little Wattlebird
- Long-billed Corella
- Long-billed Starthroat
- Long-eared Owl
- Long-tailed Broadbill
- Long-tailed Duck
- Long-tailed Fantail
- Long-tailed Hermit
- Long-tailed Paradigalla
- Long-tailed Parakeet
- Long-tailed Tit
- Long-tailed Wood Partridge
- Lord Derby's Parakeet
- Loria's Satinbird
- Loten's Sunbird
- Louisiade White-eye
- Lovely Fairywren
- Lowland Peltops
- Lucifer Sheartail
- Luzon Bleeding-heart