Kretania martini, or Martin's blue, is a species of North African butterfly in the family Lycaenidae and the subfamily Polyommatinae.

[5] The imago of the species is a small butterfly which is sexually dimorphic.

The top of the male is blue purple with a thin black border and a white fringe, while that of the female is dark brown with a blue basal suffusion, white fringe, and a series of orange submarginal half moons and black marginal spots on the hindwings.

The ornamentation resembles a similar species, Kretania allardii.

[3][6] It prefers fairly dry and flowery open environments, generally between 1,000 and 2,100 m above sea level.