Dahmen is a German surname. Notable people with the surname include:
Andrea Dahmen (born 1939), German actress Aymen Dahmen (born 1997), Tunisian professional footballer Cathee Dahmen (1945–1997), model in the 1960s and 1970s Finn Dahmen (born 1998), German footballer Jan Dahmen (1898–1957), Dutch violinist Janosch Dahmen (born 1981), German politician Joel Dahmen (born 1987), American professional golfer Josef Dahmen (1903–1985), German actor Julia Dahmen (born 1977), German television actress Karin Dahmen (born 1969), German physicist Udo Dahmen (born 1951), German drummer and author Wolfgang Dahmen (born 1949), German mathematician