Michelle Harrison (born Michelle Nicole Johnston, 24 March 1975 in Puyallup, Washington, USA) – American actress, trained at Circle in the Square Theatre School in New York City. Married to Matthew Harrison since 1998, with two children. Currently based in British Columbia, Canada.

Her most notable film roles include Jane in Paycheck (2003), Detective Kate Tunney in The Invisible (2007), Anisha Carpenter in Good Luck Chuck (2007), Cynthia in Love Happens (2009), Laura Lee Reed in Stagecoach: The Texas Jack Story (2016), and Rhian Flynn in Fifty Shades Freed (2018). On television she is best known for Nora Allen (Barry Allen's mother) in The Flash (2014–2023, 20+ episodes), Kate Henry in Wild Roses (2009, 13 episodes, series regular), Amy Bowman in Family Law (2021–present, series regular), and guest appearances in The Outer Limits (1995), Stargate SG-1 (1997), House (2004), The L Word (2004), Supernatural (2005), Psych (2006), Fringe (2008), Stargate Universe (2010), NCIS (2003), and The Magicians (2015).