Michael Andrew Fox (born June 9, 1961), known professionally as Michael J. Fox, is a Canadian actor, comedian, author, film producer and activist with a film and television career spanning from the 1970s. He starred in the Back to the Future trilogy in which he portrayed Marty McFly. Other notable roles have included his portrayal of Alex P. Keaton on the American sitcom Family Ties (1982–1989) and Mike Flaherty on the ABC sitcom Spin City (1996–2000). He has won five Primetime Emmy Awards, four Golden Globe Awards, a Grammy Award, and two Screen Actors Guild Awards.

Fox was diagnosed with Parkinson's disease in 1991 at age 29, and disclosed his condition to the public in 1998. He semi-retired from acting in 2000 as the symptoms of the disease worsened. He has since become an advocate for research toward finding a cure, and founded the Michael J. Fox Foundation. Sweden's Karolinska Institute gave him an honoris causa doctorate on March 5, 2010 for his work advocating a cure for Parkinson's disease.

Since 1999, Fox has mainly worked as a voice-over actor in films such as Stuart Little and Disney's Atlantis: The Lost Empire. On the CBS TV show The Good Wife, he earned Emmy nominations for three consecutive years for his recurring role as crafty attorney Louis Canning. He has also taken recurring guest roles and cameo appearances in Boston Legal, Scrubs, Curb Your Enthusiasm, Rescue Me, and Designated Survivor. He has written three books: Lucky Man: A Memoir (2002), Always Looking Up: The Adventures of an Incurable Optimist (2009), and A Funny Thing Happened on the Way to the Future: Twists and Turns and Lessons Learned (2010). He was appointed an Officer of the Order of Canada in 2010, and was also inducted into Canada's Walk of Fame in 2000.