Olav Gjærevoll (24 September 1916 – 30 August 1994) was a Norwegian botanist and politician for the Labour Party.

Gjærevoll was a professor of botany at the University of Trondheim from 1958 to 1986, and was a specialist in alpine plants.

On the local level he was a member of Trondheim city council from 1951 to 1963, 1967 to 1968 and 1979 to 1987, serving as mayor for two periods 1958–1963 and 1979–1981.

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