Diógenes Luna Martínez (born May 1, 1977) is a boxer from Cuba, who won the bronze medal in the light welterweight division ( - 63.5 kg) at the 2000 Summer Olympics in Sydney, Australia. In the semifinals he was defeated by eventual runner-up Ricardo Williams from the United States. A year later he won the world title at the 2001 World Amateur Boxing Championships in Belfast, Northern Ireland.