Forster's Blue Polyommatus aserbeidschanus is a butterfly in the family Lycaenidae. It was described by Walter Forster in 1956. It is found in the Caucasus, Armenia and Turkey.
The larvae feed on Astragalus species, thus in Armenia they are found on Astragalus prilipkoanus.[1] The flight period is from late July till mid-August.
The species inhabits calcareous grasslands at the elevation from 2,000 to 2,500 m above sea level.