- Lapland Longspur
- Large-billed Crow
- Large-tailed Nightjar
- Lark Sparrow
- Latham's Snipe
- Laughing Dove
- Laughing Gull
- Laughing Kookaburra
- Least Sandpiper
- Lesser Black-backed Gull
- Lesser Black-backed Gull (heuglini)
- Lesser Crested Tern
- Lesser Flamingo
- Lesser Frigatebird
- Lesser Goldfinch
- Lesser Grey Shrike
- Lesser Kestrel
- Lesser Violetear
- Lesser Whitethroat
- Lesser Yellowlegs
- Light-vented Bulbul
- Limpkin
- Little Bittern
- Little Black Cormorant
- Little Blue Heron
- Little Bunting
- Little Bustard
- Little Corella
- Little Crake
- Little Egret
- Little Grebe
- Little Owl
- Little Pied Cormorant
- Little Ringed Plover
- Little Stint
- Little Tern
- Loggerhead Shrike
- Long-billed Dowitcher
- Long-billed Pipit
- Long-billed Plover
- Long-billed Thrasher
- Long-eared Owl
- Long-tailed Duck
- Long-tailed Jaeger
- Long-tailed Shrike
- Long-tailed Silky-flycatcher
- Long-tailed Tit
- Long-toed Stint