Harold "Hal" P. Warren (October 23, 1923 - December 26, 1985) was a fertilizer salesman who lived in the El Paso, Texas area. He is best remembered for writing, directing, producing, and starring in the 1966 movie "Manos" The Hands of Fate.
Warren continued on as a fertilizer salesman for some time after making Manos. He tried pitching a sequel to Manos and another script named Wild Desert Bikers, but failed. Warren then tried turning the script of Wild Desert Bikers into a book entitled Satan Rides a Bike, but could not find a publisher willing to publish his work.
Hal Warren died in December 1985. His widow moved to Colorado.