Tanychastis is a genus of moths of the family Oecophoridae.

Species Tanychastis lysigama Meyrick, 1910 Tanychastis moreauella Guillermet, 2011

References Meyrick, E. 1910a. Descriptions of Micro-Lepidoptera from Mauritius and Chagos Isles. - Transactions of the entomological Society of London 1910 (3):366–377