Xestia baja, the dotted clay, is a species of moth of the family Noctuidae.

It is found in Europe, Turkey, northern Iran, Transcaucasia, the Caucasus, central Asia, Siberia, Mongolia, Tibet, China, Korea and Japan.

Forewing dull red brown, with slight lilac-grey tinge in places; a distinct black preapical costal bar; upper stigmata large, with slight pale rings; lower lobe of reniform dark; median shade forming a brown space between the stigmata; a black dot near base of cell; hindwing ochreous or yellowish grey.

The moth flies from July to August depending on the location.

The larvae feed on Myrica gale, Rubus species and other plants and trees.