Thomas David Morrison (c. 1796 – March 19, 1856) was a doctor and political figure in Upper Canada. He was born in Quebec City around 1796 and worked as a clerk in the medical department of the British army during the War of 1812. He studied medicine in the United States and returned to York in 1824 to become a doctor in Upper Canada. He treated patients and served on the Toronto Board of Health during the 1832 and 1834 cholera outbreaks and co-founded the York Dispensary. In 1834 he was elected to the 12th Parliament of Upper Canada, representing the third riding of York County as part of the reform movement. That same year he was elected as an alderman to the Toronto City Council and reelected the subsequent two years. In 1836, he served a term as mayor of Toronto.