Chrysaster ostensackenella is a moth of the family Gracillariidae.

It is known from Ontario, Québec and Nova Scotia in Canada, and the United States (Illinois, Kentucky, New York, Maine, Maryland, Michigan, Vermont, Arizona, Massachusetts, North Carolina and Connecticut).

[3][4] It has also been recorded in 2015 from China[5] and in 2017 from Korea,[6] and in 2022 from Central Italy.

They mine the leaves of their host plant.

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