Palaeomystella tavaresi is a moth of the family Agonoxenidae.

It is found in the Atlantic Forest at the Serra Bonita Reserve in Brazil.

There is a narrow, ill-defined, dark-brown streak which bisects the wing longitudinally from the base to a brown, subapical, crescentic marking, edged distally with dark-grey scales.

The hindwings are covered with light brown scales on both sides.

The species is named in honor of the Jesuit priest Joaquim da Silva Tavares, a Portuguese naturalist and a pioneer in the study and description of Brazilian cecidology.