| Common Name | Scientific name |
|---|---|
| Kirtland's Warbler | Setophaga kirtlandii |
| Kittlitz's Murrelet | Brachyramphus brevirostris |
| Kittlitz's Plover | Charadrius pecuarius |
| Kona Grosbeak | Chloridops kona |
| La Sagra's Flycatcher | Myiarchus sagrae |
| La Selle Thrush | Turdus swalesi |
| Labrador Duck | Camptorhynchus labradorius |
| Ladder-backed Woodpecker | Picoides scalaris |
| Lady Amherst's Pheasant | Chrysolophus amherstiae |
| Lake Duck | Oxyura vittata |
| Lammergeier | Gypaetus barbatus |
| Lanai Hookbill | Dysmorodrepanis munroi |
| Lance-tailed Manakin | Chiroxiphia lanceolata |
| Lanceolated Monklet | Micromonacha lanceolata |
| Lanceolated Warbler | Locustella lanceolata |
| Lanner Falcon | Falco biarmicus |
| Lapland Longspur | Calcarius lapponicus |
| Large-billed Seed-Finch | Sporophila crassirostris |
| Large-billed Tern | Phaetusa simplex |
| Large-footed Finch | Pezopetes capitalis |
| Lark Bunting | Calamospiza melanocorys |
| Lark Sparrow | Chondestes grammacus |
| Lattice-tailed Trogon | Trogon clathratus |
| Laughing Dove | Spilopelia senegalensis |
| Laughing Falcon | Herpetotheres cachinnans |
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