Glenn Edgar Morris was a U.S. track and field athlete. He won a gold medal in the Olympic decathlon in 1936, setting new world and Olympic records. He attended Colorado A&M — now known as Colorado State University — and played football as well as track and field. He was also an occasional actor, he portrayed Tarzan in Tarzan's Revenge.

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.