The six-spot prickelback (Kasatkia seigeli) is a species of marine ray-finned fish of belonging to the family Stichaeidae, the pricklebacks and shannies.

The six-spot prickleback was first formalled described in 1999 by Mason Posner and Robert J. Lavenberg with the type locality given as Intake Cove, off the Diablo Canyon Power Plant) in San Luis Obispo County, California.

[2] The specific name honors Jeffrey A. Seigel, who was the manager of the fish collection at the Los Angeles County Museum of Natural History in recognition of his "many years of hard work on the fishes of California".

[3] The six-spot prickleback is distinguished from its congener by there being scales present on the cheek and on the head, by having 6 eye-like spots on the dorsal fin rather than 12-14, the dorsal fin has 41-44 spines compared to 43-47 and the nal fin has 2 or 3 spines and 39-41 soft rays compared to 2 spines and 45-49 soft rays.

[4] The six-spot prickleback is found in the eastern Pacific Ocean where it is known only from northern and central California/[1] This species is demersal and occurs at depths between 6 and 26 m (20 and 85 ft).