Thomas Jacob "Jack" Black (born August 28, 1969) is an American actor, comedian, and musician. He is known for roles in family and comedy films, in addition to his voice work in animated films. His awards include a Children's and Family Emmy Awards, a Grammy Award, and nominations for three Golden Globe Awards.

After portraying supporting roles in films including Dead Man Walking (1995), The Cable Guy (1996), Mars Attacks! (1996), and Enemy of the State (1998), Black had his breakout role in the musical film High Fidelity (2000). This led to larger roles in films like Shallow Hal (2001) and Orange County (2002), before he solidified his leading man status with his starring role in School of Rock (2003). Black has since starred in King Kong (2005), The Holiday (2006), Nacho Libre (2006), Tropic Thunder (2008), Bernie (2011), Goosebumps (2016), Jumanji: Welcome to the Jungle (2017), its sequel Jumanji: The Next Level (2019), and The House with a Clock in Its Walls (2018). He has also voiced Po in the Kung Fu Panda franchise (2008–present) and Bowser in The Super Mario Bros. Movie (2023).

Black is the lead vocalist of the duo Tenacious D, which he formed in 1994 with long-time friend Kyle Gass. They won the Grammy Award for Best Metal Performance for "The Last in Line" in 2015. Since 2018, Black has operated a YouTube channel called Jablinski Games.