Calvin R. Johnson (May 22, 1822 – January 30, 1897) was a member of the Wisconsin State Assembly.
[2] During the American Civil War, Johnson was a captain with the 14th Wisconsin Volunteer Infantry Regiment.
Previously, he had served in the United States Army during the Mexican–American War under Winfield Scott.
Johnson represented the counties of Buffalo, Jackson and Trempealeau in the Assembly.
Additionally, Johnson was Register of Deeds and District Attorney of Jackson County.