Harry Fritz (born February 19, 1951 in Yuma, Arizona, United States) is a Canadian former professional tennis player. He reached a career-high ATP singles ranking of No. 124 and an unknown career-high ATP doubles ranking.
Fritz was born in the United States, but represented Canada and resided in Toronto, Ontario. He competed in the main draw of the 1980 US Open in singles, losing in the first round. In doubles, he reached the second round of the 1991 US Open. He also lost in the first round in doubles of the 1973 Wimbledon, 1978 Australian Open and 1977, 1979, 1980 US Open. In March 1980 at the Grand Prix event in Lagos, Nigeria, he became the first Canadian to reach and ATP final in singles or doubles. At the 1982 Davis Cup Americas Zone semifinal between Canada and Venezuela, he played in the longest singles rubber by number of games. He defeated Jorge Andrew by the score of 16–14, 11–9, 9–11, 4–6, 11–9, a total of 100 games. He retired in 1984.
Fritz is currently living in Rancho Mirage, California, United States, where he is coaching for the Tour Level Player Development Program LLC along his brother Guy and other coaches. He is the uncle of American tennis player Taylor Fritz and the brother-in-law of American former tennis player Kathy May, who was ranked as high as No. 10 in the world in July 1977. Fritz has coached his nephew Taylor and top-10 player CoCo Vandeweghe.