Macha Grenon (born June 7, 1968) is a Canadian film and television actress.
Born in Montreal, Quebec, Grenon's credits include roles in the television series Urban Angel, Scoop, Le cà Âur a ses raisons, Emily of New Moon, Nouvelle adresse and H<sub>2</sub>O, as well as the films The Pianist, Stardom, Familia, Windsor Protocol, You Can Thank Me Later, Days of Darkness, Barney's Version and The Year Dolly Parton Was My Mom. She garnered a Best Actress nomination at the 26th Genie Awards for her performance in Familia.
Her father, Michel Grenon, was a history professor at the Université du Québec àMontréal, and her grandfather, Hector Grenon, was a historian who wrote several books on the history of Montreal.