Michael J. McDermott (January 18, 1893 – October 19, 1970) was an American breaststroke swimmer and water polo player who competed in the 1912 Summer Olympics and in the 1920 Summer Olympics.
He was born and died in Chicago.
In 1912 he was disqualified in the 200 metre breaststroke event as well as in the 400 metre breaststroke competition.
Eight years later he was eliminated in the semi-finals of the 200 metre breaststroke event as well as in the semi-finals of the 400 metre breaststroke competition.
At the 1920 Games he was also part of the American water polo team which finished fourth in the Olympic tournament. He played two matches.