Thomas Hiram Preston (October 22, 1855 – November 7, 1925) was an Ontario journalist and political figure.
He represented Brant South in the Legislative Assembly of Ontario as a Liberal member from 1899 to 1908.
Preston apprenticed with the Woodstock Sentinel and then worked as a compositor at the Globe in Toronto.
He worked as night editor at the Globe and then was managing director at the Winnipeg Sun from 1882 to 1890.
He was first elected in an 1899 by-election held after Arthur Sturgis Hardy retired.