Clepsicosma is a genus of moths in the family Crambidae. As at 2022, this genus contains only one described species, Clepsicosma iridia, which is endemic to New Zealand. The species inhabits native forest in the North Island as well as the northern and western parts of the South Island down to Westland. The larval host of this species is assumed to be species of Cutty grass, possibly including Gahnia setifolia and Gahnia xanthocarpa, although the life history of this species is unknown. The adults of C. iridia are on the wing from December until May. They are nocturnal, and are attracted to light. During the day the adults rest on the underside of leaves, including those Cutty grass species that may possibly be their larval hosts.

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