Woodrow Tracy Harrelson (born July 23, 1961) is an American actor and playwright. He is the recipient of various accolades, including a Primetime Emmy Award and two Screen Actors Guild Awards, in addition to nominations for three Academy Awards and four Golden Globe Awards.

Harrelson first became known for his role as bartender Woody Boyd on the NBC sitcom Cheers (1985–1993), for which he won a Primetime Emmy Award for Outstanding Supporting Actor in a Comedy Series from a total of five nominations. He reprised his role in the acclaimed spinoff series Frasier for which he received a Primetime Emmy Award for Outstanding Guest Actor in a Comedy Series nomination.

He went on to receive three Academy Award nominations: Best Actor for The People vs. Larry Flynt (1996), and Best Supporting Actor for both The Messenger (2009) and Three Billboards Outside Ebbing, Missouri (2017). Other notable films include White Men Can't Jump (1992), Natural Born Killers (1994), Kingpin (1996), The Thin Red Line (1998), No Country for Old Men (2007), Zombieland (2009), Rampart (2011), Seven Psychopaths (2012), Now You See Me (2013), The Edge of Seventeen (2016), LBJ (2016), Solo: A Star Wars Story (2018), The Man from Toronto (2022) and Triangle of Sadness (2022). He also gained prominence for his portrayal of Haymitch Abernathy in The Hunger Games film series (2012-2015).

Harrelson received further Primetime Emmy Award nominations for Outstanding Lead Actor in a Limited Series or Movie for his portrayal of Steve Schmidt in the HBO film Game Change (2012), and for Outstanding Lead Actor in a Drama Series for his role as Marty Hart in the HBO crime anthology series True Detective (2014). He will portray E. Howard Hunt in the HBO political limited series White House Plumbers (2023).