John Harrison O'Donnell

John Harrison O'Donnell (April 7, 1838 – October 26, 1912) was a physician and political figure in Manitoba. He was a member of the Legislative Council of Manitoba from 1871 to 1876

He was born in Simcoe, Upper Canada, the son of John O'Donnell, a native of Ireland, and was educated at Victoria University and Trinity Medical College. In 1861, he married Hannah Routledge. He practised in St. Catharines, Ontario and Montreal before coming to Manitoba during the Red River Rebellion of 1869. While helping defend John Christian Schultz's property, O'Donnell was taken prisoner. He was a justice of the peace and made out the arrest warrant for Louis Riel when the Wolseley Expedition arrived in 1870. He was the first president of the Provincial Medical Health Board of Manitoba. O'Donnell served as provincial coroner and helped found the Winnipeg General Hospital. He was a professor of sanitary science at the Medical College of the University of Manitoba and served on the council for the university.

He died in Winnipeg at the age of 74.