Luxembourg lichenologist and mycologist.
Paul Diederich (born 4 May 1959) is a Luxembourgish mathematics teacher and mycologist who specialises in lichenicolous fungi (fungi that live on lichens). Since 1986 he has taught mathematics at the École de Commerce et de Gestion in Luxembourg, and from 1989 to 2008 he served as a research associate at the country's National Museum of Natural History. He has authored more than 190 publications, including major monographs and collaborative volumes, and his work has been recognised with awards such as the Van Rompaey Award (1991) and the Tuckerman Award (2004 and 2019).