Theodore Hsu MPP (/ˈʃuː/; Chinese: 徐正陶; born March 4, 1964) is a Canadian physicist and politician who has represented Kingston and the Islands in the Legislative Assembly of Ontario since 2022 as a member of the Ontario Liberal Party. Before entering provincial politics, Hsu served as a member of Parliament (MP) representing Kingston and the Islands federally from the 2011 to 2015 as a member of the Liberal Party of Canada.