Jackson Hadley (May 22, 1815 – March 3, 1867) was an American Democratic politician and businessman.
Born in Livonia, New York, he taught school in New York. In 1849, he moved to Milwaukee, Wisconsin and was in the produce and railroad businesses. He served on the Milwaukee Common Council and was the president. He also served on the Milwaukee County Board of Supervisors. In 1854, 1865, 1866, he served in the Wisconsin State Assembly; he then served in the Wisconsin State Senate in 1855–1856, 1867.