Maria "Ria" Geertruida Stalman (born 11 December 1951) is a retired discus thrower and shot putter from the Netherlands. She won the gold medal in the discus throw at the 1984 Summer Olympics, which earned her the Dutch Sportswoman of the year award the same year. Between 1973 and 1983 she won medals, including 15 gold, in the discus throw and shot put at every national championships. In July 1984 she achieved her best discus throw of 71.22 m, which remains the Dutch record.