Diane Lynn Dixon (born September 23, 1964) is an American athlete who competed mainly in the 400 metres.

She competed for the United States in the 1988 Summer Olympics held in Seoul, South Korea in the 4 x 400 metres where she won the Silver medal with her teammates Denean Howard, Valerie Brisco-Hooks and Florence Griffith Joyner.

Dixon was also a part of two medal-winning teams in the 4x400 relay at the IAAF World Championships, taking a bronze in 1987 in Rome and a silver in 1991 in Tokyo.

Dixon was known for her aggressive frontrunning style indoors, where she could take the lead at the break (after the first 50 meters) and hold off her competitors who would then be forced to try to run around her.

That record stood until March 13, 2010, when it was broken by Francena McCorory from Hampton University at the NCAA Championships.