Therrya is a genus of fungi within the Rhytismataceae family. The genus was circumscribed by Pier Andrea Saccardo in Michelia vol.2 (8) on page 604 in 1882. The genus name of Therrya is in honour of Jean Joseph Therry (1833–1888), who was a French merchant and banker. He was also a self-taught botanist (in Mycology and Lichenology).