Mary Olive McKean (August 10, 1915 – March 31, 2006), also known by her married name Olive Mucha, was an American competition swimmer, swimming coach, and American record holder, who represented the United States at the 1936 Summer Olympics in Berlin, winning a bronze medal in the 4x100 freestyle relay.

Ray Daughters, the talented Hall of Fame coach of the Washington Athletic Club, saw Olive in a race and offered her a scholarship to the highly competitive swimming program.

The national championship relay team McKean swam with at Washington Athletic included Doris Buckley, Mary Lou Petty and Betty Lea.

McKean's Washington Athletic Club teammate Mary Lou Petty, also swam with the U.S. team at the 1936 Olympics, and finished fourth in the 400-meter freestyle.

Carolyn Wood, a 1960 Olympic gold medalist, worked with McKean shortly before retiring from competition.

[2] In June, 1966, McKean worked with Schollander when she served as the Assistant Coach for the U.S. American Athletic Union Team that competed in Moscow in Mid-June, and may have coached Schollander when he lived in Lake Oswego, Oregon, seven miles North of Portland.

[8][2] For many years, she played weekly water volleyball at the Multinomah Club, particularly nearing the end of her life.

[2] McKean died at the age of 90 from heart failure in Troutdale, Oregon after a short illness on March 31, 2006.