Calvin Leavy (April 20, 1940 – June 6, 2010) was an American soul-blues and electric blues singer and guitarist. He had a hit single in 1970, when "Cummins Prison Farm" peaked at number 40 on the US Billboard R&B chart and stayed on the chart for five weeks. Locally, it was number one on the chart of radio station WDIA, based in Memphis, Tennessee.
Later in his life, Leavy became the first person indicted under the 1988 drug kingpin law. He died in prison.