Hawaiian Blue
Udara blackburni
- Least concern
- Card rarity: Common
- Insects

Udara blackburni, the Koa butterfly, is a butterfly in the family Lycaenidae that is endemic to Hawaiʻi. It is also known as Blackburn's butterfly, Blackburn's bluet, Hawaiian blue or green Hawaiian blue.
Classification
- Class
- Insecta
- Order
- Lepidoptera
- Family
- Lycaenidae
- Genus
- Udara