Karel Lismont (Dutch pronunciation: [ˈkaːrəl ˈlɪsmɔnt],[1] French pronunciation: [kaʁɛl lismɔ̃]; born 8 March 1949) is a former Belgian long-distance runner.

He won two marathon medals: a silver in 1972 and a bronze in 1976, finishing ninth and twenty-fourth in 1980 and 1984, respectively; he was less successful in the 10,000 m, finishing eleventh in 1976 and failing to reach the final in 1972.

Lismont also won one gold and two bronze medals in the marathon at the 1971, and 1978 and 1982 European Championships.

He remains the most successful medal-winning Belgian marathoner in international competition as of 2021.

This biographical article relating to Belgian athletics is a stub.