The Melanoma World Society (MWS) is the successor organization to the WHO Melanoma Group. The latter established the World Congress of Melanoma in the years 1985-2005, conducted trials and other projects with melanoma patients. The WHO melanoma group was disbanded in 2005, as WHO no longer financially supported such expert groups. MWS was initiated at the 8th World Congress of Melanoma 2013 in Hamburg, founded in June 2014 in Munich, and registered in January 2016.