William Irvine (February 14, 1820 – November 12, 1882) was an American politician, a United States Representative for New York's 28th district, and a lieutenant colonel in the Union Army during the American Civil War.

Irvine commenced his law practice in Corning, Steuben County, New York.

[2] At the start of the Civil War he entered the army and assisted in raising the 10th New York Cavalry, of which he became lieutenant colonel on November 25, 1861.

He with his regiment served in fifty-five battle engagements from 1862 to the last conflict at Appomattox, Virginia in April 1865.

After the war he moved to San Francisco, California and resumed the practice of law until his death.