Ivo "Ivan" Mrázek (18 January 1926 – 4 April 2019) was a Czech professional basketball player and coach. He played as a point guard. In his club career, he won 6 Czechoslovak League championships (1947, 1948 2×, 1949, 1950, 1951) with Brno. He played for the Czechoslovakia national team. He won the gold medal at the EuroBasket in 1946 with the national team. He also won three EuroBasket silver medals, in 1947, 1951 and 1955. He played for Czechoslovakia in two Summer Olympics, in 1948 and 1952.