Dragon in Jail is a 1990 Hong Kong action film directed by Kent Cheng and starring Andy Lau, Kenny Ho and Gigi Lai.

Wayne Cheung (Kenny Ho) is a rich heir who impulsively committed a crime because he was unable to accept the fact that his mother remarried.

After being sentenced to prison, he is bullied by his inmates but is helped by his roommate Henry (Andy Lau), whom he befriends.

After release, Wayne goes to study law in Britain while Henry joins the triads due to his family environment.

Due to his conflict with another triad leader Charlie Ma (William Ho), Henry's pregnant wife Winnie (Gigi Lai) is raped and killed.