Keith John Cullen (born 13 June 1972) is a male former long-distance runner from England who competed at two Olympic Games.
At the 1996 Olympic Games in Atlanta, Cullen represented Great Britain in the men's 3000 metres steeplechase, where he was eliminated in the semi-finals.
He represented England in the 5,000 metres event, at the 1998 Commonwealth Games in Kuala Lumpur, Malaysia.
Cullen represented Great Britain at the 2000 Summer Olympics in the men's marathon and finished in 19th place, clocking 2:16:59. He finished on the podium on three occasions at the AAA Championships in 1992, 1995 and 1996.
He is now a Graphic Designer living in North London.