- La Sagra's Flycatcher
- Lady Amherst's Pheasant
- Lake Duck
- Lanner Falcon
- Lappet-faced Vulture
- Large Fig Parrot
- Large Rock Martin
- Lark-like Bunting
- Laughing Dove
- Laughing Gull
- Laughing Kookaburra
- Lava Heron
- Lawrence's Goldfinch
- Laysan Duck
- Leaden Flycatcher
- Least Grebe
- Least Sandpiper
- Lemon-bellied Flyrobin
- Lemon Dove
- Lesser Antillean Bullfinch
- Lesser Black-backed Gull
- Lesser Blue-eared Starling
- Lesser Crested Tern
- Lesser Flamingo
- Lesser Masked Weaver
- Lesser Rhea
- Lesser Scaup
- Lesser Sooty Owl
- Lesser Striped Swallow
- Lesser Whistling Duck
- Lesser White-fronted Goose
- Lesser Whitethroat
- Lesser Yellow-headed Vulture
- Lesser Yellowlegs
- Lesson's Motmot
- Lewin's Honeyeater
- Lichtenstein's Sandgrouse
- Lilac-breasted Roller
- Limpkin
- Lineated Barbet
- Lineated Woodpecker
- Little Bee-eater
- Little Bittern
- Little Black Cormorant
- Little Blue Heron
- Little Bronze Cuckoo
- Little Corella
- Little Cormorant
- Little Egret
- Little Friarbird
- Little Grebe
- Little Owl
- Little Pied Cormorant
- Little Ringed Plover
- Little Stint
- Little Wattlebird
- Little Weaver
- Little Woodswallow
- Livingstone's Turaco
- Loggerhead Kingbird
- Long-billed Corella
- Long-billed Pipit
- Long-crested Eagle
- Long-eared Owl
- Long-tailed Duck
- Long-tailed Glossy Starling
- Long-tailed Ground Roller
- Long-tailed Mockingbird
- Long-tailed Nightjar
- Long-tailed Shrike
- Long-tailed Tit
- Long-tailed Triller
- Long-toed Lapwing
- Long-wattled Umbrellabird
- Lord Derby's Parakeet
- Luzon Bleeding-heart