Werner Rodolfo Greuter, (born February 27, 1938) in Genoa, Italy, as a Swiss national, is a botanist. He is the chair of the Editorial Committee for the International Code of Botanical Nomenclature (ICBN) - the Tokyo Code (1994) and the St Louis Code (2000). His proposed policy as regards registration of botanical names proved unpopular and in 1999 he stepped back, not being elected anew: he completed his term as chair to be succeeded at Vienna in 2005. He has returned as a member of the editorial committee, contributing to the renamed International Code of Nomenclature for algae, fungi, and plants, the "Melbourne Code" (2012).