Dialectica sanctaecrucis is a moth of the family Gracillariidae.

It is known from Cuba, the Dominican Republic, Jamaica, Puerto Rico, the Virgin Islands (Saint John, Saint Croix and Saint Thomas) and the Galápagos Islands.

[1] The larvae feed on Solanum melongena and Solanum torvum.

They probably mine the leaves of their host plant.

This article relating to moths in subfamily Acrocercopinae is a stub.