Jack Bauer is a fictional character and the protagonist of the Fox television series 24. His character has worked in various capacities on the show, often as a federal agent of the Counter Terrorist Unit (CTU) based in Los Angeles, and working with the FBI in Washington, D.C. during season 7. Within the 24 storyline, Bauer is a key member of the CTU, its Director in Season 1, and is often portrayed as their most capable agent. Bauer's job usually involves helping prevent major terrorist attacks on the United States, saving both civilian lives and government administrations. On many occasions, Jack does so at great personal expense, as those he thwarts subsequently target him and his loved ones. He is not a crooked agent; however, Bauer's frequent use of torture to gather information has generated much controversy and discussion.

Actor Kiefer Sutherland portrays Jack Bauer in the television show and video game. The television series was originally set to end on May 24, 2010, after eight successful seasons but was renewed for a ninth season, which premiered on May 5, 2014. A feature film was set to be released; however, discussions ended over a contract dispute with Fox.

TV Guide ranked him No. 49 on their list of "TV's Top 50 Heroes" and Sky 1 listed Jack as No. 1 on their list of "TV's toughest men". Entertainment Weekly named Jack Bauer one of The 20 All Time Coolest Heroes in Pop Culture. In June 2010, Entertainment Weekly also named him one of the 100 Greatest Characters of the Last 20 Years. Jack is also the only character in the show to have appeared in all episodes.