Leander Clark (July 17, 1823 - December 22, 1910) was an American businessman, Iowa state legislator, Union Army officer during the Civil War, and Indian agent who was the namesake for Leander Clark College. In 1852, after his sojourn in California, he settled in Tama County, Iowa. In 1855 he became a justice of the peace in Tama County, in 1857 he began a four-year term as county judge, and in 1861 he began a term as the county's representative in the Iowa General Assembly.