Henry Kleist (September 29, 1860 – November 13, 1929) was a farmer from Rantoul, Wisconsin, United States, who served one term as a state senator. He was a member of the Socialist Party. Kleist was born on a farm in the Town of Eaton, Manitowoc County, Wisconsin on September 29, 1860. Six years later his parents moved to the Town of Rantoul in Calumet County. He attended public schools as a boy in the winter, working on the farm in summer, and later worked in the woods in winter. After the 1888 death of his father, he and his brother, Charles, operated the homestead farm, now known as Kleist Brothers' Grain and Dairy Farm, and continued to live with their mother. By 1918, he was president of the Calumet County branch of the American Society of Equity (at that time "the greatest farmer orga