Ottawa Centre is an urban provincial electoral district in Ontario, Canada that has been represented in the Legislative Assembly of Ontario since 1968. While the riding's boundaries have changed over the years to account for population changes, the riding has always comprised the central areas of Ottawa, the nation's capital.

The Ontario New Democratic Party is a social-democratic political party in Ontario, Canada. The party currently forms the Official Opposition in Ontario following the 2018 general election. It is a provincial section of the federal New Democratic Party. It was formed in October 1961 from the Co-operative Commonwealth Federation and the Ontario Federation of Labour (OFL).