William Heilman (October 11, 1824 – September 22, 1890) was an American businessman who served two terms as a U.S. Representative from Indiana from 1879 to 1883.

Born in Albig, Grand Duchy of Hesse, Heilman immigrated to the United States in 1843 and settled on a farm in Posey County, Indiana.

After moving to Evansville, Indiana, he worked for a manufacturing company and subsequently became president of a cotton mill.

He served in the Indiana State Senate from 1876 until March 3, 1879.

He was an unsuccessful candidate for reelection in 1882 to the Forty-eighth Congress, losing the general election to John Kleiner.