Keith Allen Clearwater (born September 1, 1959) is an American professional golfer who has won two tournaments on the PGA Tour.

Clearwater was born in Long Beach, California. He went to Northgate High School (Walnut Creek, California) and was one of many Californians to attend Brigham Young University in Provo, Utah and play on the school's golf team. In 1981, his junior year, he helped lead BYU to the 1981 NCAA Championship, and was named as a first team All-American. During his tenure at BYU, his teammates included future professional golfers Rick Fehr, Richard Zokol and Bobby Clampett. In his senior year, 1982, he was named as a second team All-American. He turned pro in 1982, and joined the PGA Tour in 1987.

Clearwater won two tournaments on the PGA Tour, both in his rookie season of 1987. He won the prestigious Colonial National Invitation in the spring of that year with a 14 under par 266, which tied the previous tournament record set by Corey Pavin in 1985. Later in that same season, he won the Centel Classic.

Clearwater has had a moderately successful career in professional golf. He has just over two dozen top-10 tournament finishes in PGA Tour events. His best finish in a major was a T-31 at the 1987 U.S. Open, which included a third round of 64 that tied the Olympic Club course record and also tied the lowest third round score in the U.S. Open. (Ben Crenshaw in 1981 and Loren Roberts in 1994 are the other two players to have carded a 64 in the third round at the U.S. Open.)

Clearwater lives in Orem, Utah. He competes on the Champions Tour, but plays the PGA Tour's Colonial National Invitational every year.