David Allen (born December 28, 1945) is a productivity consultant. He is the creator of the Getting Things Done time management method.

He grew up in Shreveport, Louisiana where he acted and won a state championship in debate. He went to college at New College, now New College of Florida, in Sarasota, Florida. His career path has included jobs as a magician, waiter, karate teacher, landscaper, vitamin distributor, glass-blowing lathe operator, travel agent, gas station manager, U-Haul dealer, moped salesman, restaurant cook, personal growth trainer, and manager of a lawn service company and a travel agency. He is also an ordained minister with the Movement of Spiritual Inner Awareness. He claims to have had 35 professions before age 35.  He began applying his perspective on productivity with businesses in the 1980s when he got a contract to design a program for executives and managers at Lockheed.

Allen has written two books, Getting Things Done: The Art of Stress-Free Productivity, which describes his productivity program and Ready for Anything: 52 Productivity Principles for Work and Life, a collection of newsletter articles he has written. He lives in Ojai, California with his fourth wife, Kathryn.