David Allen (b. December 28, 1945) is a productivity trainer and consultant. He is the creator of Getting Things Done time management method.
David Allen (born 1972 in Englewood, Colorado) is the creator of a number of popular niche-games, namely and Demise.
David Arthur Allen (born 29 October 1935 in Horfield, Bristol, Gloucestershire, England) is a former cricketer who played first-class cricket for Gloucestershire between 1953 and 1972. He also played 39 Test matches for England.