Dicymolomia opuntialis is a moth in the family Crambidae.

[1] It is found in North America, where it has been recorded from California.

There is a wavy black line with an orange blotch at the costa.

The hindwings are silvery grey with five black marginal spots, separated by metallic scales and shaded with dull orange.

The larvae feed on Opuntia species, mining in the joints of the cactus pads.