Thumatha fuscescens is a moth of the family Erebidae first described by Francis Walker in 1866.

It is found in Australia, South-East Asia, India, Sri Lanka, the Comoros, Réunion, Madagascar, and Gabon.

The male has a pale reddish-brownish body.

Forewings possess traces of antemedial and postmedial waved lines.

Sub-marginal and marginal specks series present.