Kretania pylaon, the zephyr blue, is a butterfly in the family Lycaenidae.

This species was considered to encompass a lot of subspecies across Europe and Asia, several of which are now generally viewed as distinct species, such as Kretania hesperica (Spain), K. trappi (Alps), K. sephirus (Eastern Europe, Caucasus, Asia Minor), K. zephyrinus (Caucasus, Central Asia), K. nicholli (Levant), and K. philbyi (Levant).

They are attended by ants of the Bothriomyrmex, Tapinoma, Lasius, Camponotus, Tetramorium and Formica genera.

The male of this small Blue recalls by the peculiar violet sheen of the upperside the form planorum of argyrognomon.

Pylaon in Greek mythology is one of the twelve sons of Neleus and Chloris , who died at the hands of Hercules There is an official color called zephyr blue, which bears considerable resemblance to the color scheme of Kretania pylaon.