Douglas Fred Tewell (born August 27, 1949) is an American professional golfer who has won several tournaments at both the PGA Tour and Champions Tour level, including two senior major championships. Tewell was born in Baton Rouge, Louisiana and reared in Stillwater, Oklahoma. He got started in the game by working as a caddie for his father. He attended Oklahoma State University in his hometown on a basketball scholarship his freshman year, but later switched to golf. Tewell graduated and turned pro in 1971.