Michael John Hare, 2nd Viscount Blakenham (25 January 1938 – 8 January 2018), was a British hereditary peer and environmentalist. He was the son of Conservative politician and government minister John Hare, 1st Viscount Blakenham and Hon. Beryl Nancy Pearson, daughter of Harold Pearson, 2nd Viscount Cowdray. Through his sister, Joanna Freda Hare, he was a brother-in-law of U.S. Supreme Court Justice Stephen Breyer.