Christina Tracy Boxer-Cahill (born 25 March 1957) is a retired female middle distance athlete from England. She represented Great Britain at three Olympic Games, in Moscow 1980, Los Angeles 1984 and Seoul 1988 and trained at Aldershot, Farnham & District AC. In Seoul, she finished fourth in the 1500 metres final. She also won a gold medal in the 1500 m at the 1982 Commonwealth Games. In 1979, she became the first British woman in history to run the 800 metres in under two-minutes.