Gonçalo Nicau (born 3 July 1982) is a Portuguese former professional tennis player who competed in the ITF Men's Circuit. He achieved his highest singles ranking of 531 in the world by the Association of Tennis Professionals (ATP) in February 2007. Though he did not enter a singles event in the ATP Challenger Tour, Nicau did play in the doubles event at the 2006 Estoril Open and was selected for two Davis Cup ties in 2006.