Robert Bruce Mathias was an American decathlete, politician, and actor. Representing the United States, he won two Olympic gold medals in the Decathlon, at the 1948 and the 1952 Summer Games. As a Republican, he served in the US House of Representatives for California's 18th congressional district, for four terms from 1967 to 1975.

The decathlon is a combined event in athletics consisting of 10 track and field events. The word "decathlon" was formed, in analogy to the word "pentathlon", from Greek δέκα and ἄθλος. Events are held over two consecutive days and the winners are determined by the combined performance in all. Performance is judged on a points system in each event, not by the position achieved. The decathlon is contested mainly by male athletes, while female athletes typically compete in the heptathlon.