Robert Lee Beck (December 30, 1936 – April 2, 2020) was an American modern pentathlete and fencer who won three gold medals in these disciplines at the Pan American Games in 1963–1971. He also won bronze medals in the individual and team modern pentathlon events at the 1960 Summer Olympics. He was less successful at the 1968 Games, placing 22nd individually and fourth with the American team. As of the Tokio 2020 Olympics, he was the last athlete from the United States to win an individual medal in men's pentathlon.