Blandford-Blenheim is a township in the Canadian province of Ontario, located in Oxford County. The township had a population of 7,149 in the Canada 2006 Census.

Its government consists of a mayor and four councillors. There are no geographic ward divisions for municipal elections; candidates for councillor campaign in the entire township and the four candidates who receive the most votes are declared elected.

The township was amalgamated in 1975 from two historic county townships, Blandford and Blenheim.