Anthony Michael Hall (born Michael Anthony Thomas Charles Hall; April 14, 1968) is an American actor, producer and comedian. After his film debut in Six Pack (1982) and a supporting role as Russell "Rusty" Griswold in National Lampoon's Vacation (1983), Hall had his breakout with starring roles in three John Hughes-directed films: Sixteen Candles, The Breakfast Club, and Weird Science. Mainstream media associated Hall with a group of young actors known as the "Brat Pack" due to his roles in those films.

Hall diversified his roles to avoid becoming typecast as his geek persona, joining the cast of Saturday Night Live (1985–1986) and starring in films such as Out of Bounds (1986), Johnny Be Good (1988), and Edward Scissorhands (1990). After multiple minor roles in the 1990s, he starred as "Shorty" Lattimore on the USA Network sitcom Claude's Crib (1997) and Microsoft co-founder Bill Gates in the television film Pirates of Silicon Valley (1999).

Hall experienced a career resurgence with the lead role in the USA Network science fiction series The Dead Zone (2002–2007) and a supporting role in the superhero film The Dark Knight (2008). In the 2010s and 2020s, Hall starred in the films Results (2015), War Machine (2017), Bodied (2017), Halloween Kills (2021), and Trigger Warning (2024). He also had a main role on the third season of the Amazon Prime Video series Reacher (2025).

Michael Anthony Thomas Charles Hall was born on April 14, 1968, in the West Roxbury neighborhood of Boston. He is the only child of blues-jazz singer Mercedes Hall's first marriage. She divorced Hall's father, Larry, an auto-body-shop owner, when their son was six months old. When Hall was three, he and his mother relocated to the West Coast, where she found work as a featured singer. After a year and a half, they returned to the East, eventually moving to New York City, where Hall grew up. Hall's ancestry is English, Irish and Italian. He has a half-sister, Mary Chestaro, from his mother's second marriage to Thomas Chestaro, a show business manager. His half-sister is a singer performing under the name Mary C. He transposed his first and middle names when he entered show business because there was another actor named Michael Hall who was already a member of the Screen Actors Guild. Hall attended St. Hilda's & St. Hugh's School of New York before moving on to Manhattan's Professional Children's School. Hall began his acting career at age eight and continued throughout high school. "I did not go to college," he has said, "but I'm an avid reader in the ongoing process of educating myself." Through the 1980s, Hall's mother managed his career, eventually relinquishing that role to her second husband.

At the age of seven, Hall started his career in commercials. He was the Honeycomb cereal kid and appeared in several commercials for toys and Bounty. His stage debut was in 1977, when he was cast as the young Steve Allen in Allen's semi-autobiographical play The Wake. He went on to appear in the Lincoln Center Festival's production of St. Joan of the Microphone, and in a play with Woody Allen. In 1980, he made his screen debut in the Emmy-winning TV movie The Gold Bug, in which he played the young Edgar Allan Poe. In 1981, he starred as Huck Finn in Rascals and Robbers: The Secret Adventures of Tom Sawyer and Huckleberry Finn opposite Patrick Creadon, but it was not until the release of the 1982 Kenny Rogers film Six Pack that he gained real notice.

The following year, Hall was chosen for the role of Rusty Griswold, Chevy Chase and Beverly D'Angelo's son, in National Lampoon's Vacation, catching the attention of the film's screenwriter John Hughes, who was about to begin directing. "For [Hall] to upstage Chevy, I thought, was a remarkable accomplishment for a 13-year-old kid," said Hughes. The film was a significant box office hit in 1983, grossing over $61 million in the United States. After Vacation, Hall moved on to other projects and declined to reprise his role in the 1985 sequel.

Hall's breakout role came in 1984, when he was cast as "The Geek", the scrawny, braces-wearing geek who pursued Molly Ringwald's character in John Hughes's directing debut Sixteen Candles. Hall tried to avoid the clichés of geekiness. "I didn't play him with 100 pens sticking out of his pocket," he said. "I just went in there and played it like a real kid. The geek is just a typical freshman." Hall landed a spot on the promotional materials along with co-star Ringwald. Reviews of the film were positive for Hall and his co-stars, and a review in People even claimed that Hall's performance "pilfer[ed] the film" from Ringwald. Despite achieving only moderate success at the box office, the film made overnight stars of Ringwald and Hall.

In 1985, Hall starred in two additional teen-oriented films written and directed by Hughes. He was cast as Brian Johnson, "the brain", in The Breakfast Club, co-starring Emilio Estevez, Judd Nelson, Ally Sheedy, and Molly Ringwald. Film critic Janet Maslin praised Hall, stating that the 16-year-old actor and Ringwald were "the movie's standout performers". Hall and fellow co-star Molly Ringwald dated for a short period after filming The Breakfast Club. Later that year, Hall portrayed Gary Wallace, another likable misfit, in Weird Science. Critic Sheila Benson from the Los Angeles Times said Hall was "the role model supreme" for the character, but she also acknowledged that "he [was] outgrowing the role" and "[didn't] need to hold the patent on the bratty bright kid". Weird Science was a moderate success at the box office but was generally well received by critics. Those roles established him as the 1980s' "nerd-of-choice", as well as a member of Hollywood's Brat Pack. Hall, who portrayed Hughes's alter egos in Sixteen Candles, The Breakfast Club and Weird Science, credited the director for putting him on the map and giving him those opportunities as a child. "I had the time of my life," he said. "I'd consider [working with Hughes again] any day of the week."