Donald ("Don") Fontana (born 1 January 1931 in Toronto) is a former top-ranking Canadian tennis player from the 1950s and 1960s.
Fontana was the year-ending number two ranked Canadian player six times, three times in the 1950s and three more in the 1960s. He was ranked in the Canadian top-ten five more times. He won the Canadian Open doubles championship three times, in 1955, 1957, and 1959 with compatriot Robert Bedard, and was a runner-up four more times.
Don won the Ontario Open singles tennis championship twice, in 1956 and 1957. He was a Pan American Games competitor twice, in 1959 and 1963.
Fontana represented Canada in Davis Cup eight times from 1955 to 1963 and had a career win-lose record of 7 and 15, 4 and 8 in singles and 3 and 7 in doubles. He was Canadian Davis Cup captain five times between 1963 and 1976.
Fontana was tournament director of the Canadian Open in 1959 and from 1971 to 1978. He was also a long-time tennis TV analyst for CTV's coverage of the Canadian Open.
Don was inducted into the Tennis Canada Hall of Fame in 2000.