Thiotricha leucothona is a moth of the family Gelechiidae. It was described by Edward Meyrick in 1904. It is found in Australia, where it has been recorded from New South Wales.[1]
The wingspan is . The forewings are shining white, with a faint ochreous tinge and with the costal edge dark fuscous towards the base. There is a crescentic wedge-shaped fuscous tornal mark reaching halfway across the wing and there are two rather suffused dark fuscous oblique streaks from the costa towards the apex. There is also a black apical dot, preceded by some fuscous suffusion. The hindwings are light grey.[2]