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.
Clark was born July 17, 1823 in Wakeman, Huron County, Ohio, where he spent his childhood on his family's farm. He was educated in the public schools and at the Academy of Oberlin College. In 1846 he moved from Ohio to Port Washington, Wisconsin where he worked as a surveyor, in a drug store owned by an older brother, and as deputy sheriff. In 1849, he undertook an overland journey to California to join the Gold Rush there. In California, he engaged in mining, packing, and trading, principally in the vicinity of Shasta and Yreka. He returned east via sea and the isthmus of Panama in 1852 after accumulating between $3,000 and $4,000.
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.