American television character, the troubled protagonist at the centre of suspense-thriller series 24.

A special agent with the Los Angeles branch of the fictional U.S. government Counter Terrorist Unit (CTU), Jack Bauer (played by Kiefer Sutherland (Sutherland, Kiefer)) is an intense, brooding loner, frequently alienating friends, family, and allies and mistrusting nearly everyone. Nonetheless, he repeatedly saves the United States from catastrophe, including an assassination plot against a presidential candidate, a deadly virus, and a nuclear attack. In carrying out his missions, Bauer exhibits an absolute trust of his own instincts, which are frequently doubted by comrades but usually prove correct. He takes extreme measures to achieve his ends (his use of torture became a subject of debate in real-world media). Within the stories of 24, Bauer's actions almost always prove expedient and in his view are justified and necessary. His CTU colleagues often hold the opposite perspective, however.

Bauer's family is often entangled in the show's complicated plots. Early in the series his daughter is kidnapped by enemy operatives, and she later joins the CTU. His wife is murdered by a double agent, one of Bauer's former lovers. His estranged father, a conspirator in a Russian plot, kidnaps his own grandson and murders Bauer's brother.

The Bauer character was introduced in 2001, in the show's first season. Each episode of the show chronicled one hour of his mission in “real time,” so that by the end of the 24th episode, a complete day had elapsed. Succeeding seasons employ the same conceit, though anywhere from three months to three years of story time might elapse in between.