- Lady Amherst's Pheasant
- Lake Duck
- Lapland Longspur
- Laughing Dove
- Laughing Gull
- Laughing Kookaburra
- Laysan Duck
- Lesser Adjutant
- Lesser Black-backed Gull
- Lesser Flamingo
- Lesser Kestrel
- Lesser Scaup
- Lesser Spotted Woodpecker
- Lesser Whistling Duck
- Lesser White-fronted Goose
- Lesser Whitethroat
- Lilac-breasted Roller
- Lilac-crowned Amazon
- Little Auk
- Little Bittern
- Little Egret
- Little Grebe
- Little Gull
- Little Owl
- Little Pied Cormorant
- Little Ringed Plover
- Little Stint
- Little Tern
- Long-billed Corella
- Long-crested Eagle
- Long-eared Owl
- Long-tailed Duck
- Long-tailed Finch
- Long-tailed Ground Roller
- Long-tailed Jaeger
- Long-tailed Tit
- Luzon Bleeding-heart