Xenothecium is a genus of fungus in the family Hyponectriaceae.

According to the 2007 Outline of Ascomycota, the placement in this family was uncertain,[1] but it was confirmed in 2020.

[2] This is a monotypic genus, its only species being Xenothecium jodophilum.

It was published by Franz Xaver Rudolf von Höhnel in Sber.

[3] This Xylariales-related article is a stub.