Thomas Paterson Hillhouse, QC (June 25, 1898 in Glasgow, Scotland – October 27, 1991) was a politician in Manitoba, Canada. He was a member of the Legislative Assembly of Manitoba from 1950 to 1969, initially serving as a Liberal-Progressive and subsequently as a Liberal, after the party changed its name.
The son of James W. Hillhouse and Mary Brown, Hillhouse came to Winnipeg with his family in 1900 and was educated there, at the University of Manitoba and at the Manitoba Law School. He served in Europe with the Canadian Expeditionary Force during World War I. He was called to the Manitoba bar in 1923 and worked as a barrister-at-law in Selkirk. Hillhouse served as a police magistrate for the province. In 1927, he married Irene McGregor. He was later named Queen's Counsel.
He was first elected to the Manitoba legislature in a by-election on October 10, 1950. Hillhouse defeated his CCF and Progressive Conservative opponents fairly easily in the riding of St. Andrews, and served as a backbench supporter of Douglas Campbell's government. He was re-elected in the 1953 election. Notwithstanding their name, the Liberal-Progressives were considered the most right-wing party in Manitoba during this period; Hillhouse, however, was seen as a leading social liberal in the party's caucus. Some expressed surprise that he was never named to cabinet.