Cremastobombycia ignota is a moth of the family Gracillariidae.

It is known from Illinois, Texas, Kentucky, Maine, New York, Massachusetts, Washington and Ohio in the United States.

The larvae feed on Elephantopus species (including Elephantopus carolinianus), Helianthus species (including Helianthus annuus and Helianthus giganteus), Ridania alternifolia, Verbesina species (including Verbesina alternifolia and Verbesina virginica).

They mine the leaves of their host plant.

This article relating to moths in the subfamily Lithocolletinae is a stub.