Kenneth Eliot Flach (May 24, 1963 – March 12, 2018) was a professional tennis player from the United States.
A doubles specialist, he won four Grand Slam men's doubles titles (two Wimbledon and two US Open), and two Grand Slam mixed doubles titles (Wimbledon and French Open).
He also won the men's doubles Gold Medal at the 1988 Olympic Games in Seoul, partnering Robert Seguso.