Batman: The Long Halloween is a 13-issue American comic book limited series written by Jeph Loeb with art by Tim Sale. It was published monthly by DC Comics from 1996 to 1997. The story is set early in Batman's career and follows the Dark Knight, along with Captain James Gordon and District Attorney Harvey Dent, as they attempt to unmask a serial killer known only as Holiday, who murders people on major holidays. The narrative unfolds over the course of a year, with each issue representing a different holiday, and weaves a complex mystery that involves Gotham City's traditional organized crime families and the emerging "freaks" like the Joker, Poison Ivy, and the Scarecrow.
The graphic novel is heavily influenced by film noir and classic detective fiction, and it explores the transformation of Harvey Dent from Gotham's White Knight into the villainous Two-Face. It is widely regarded as one of the greatest Batman stories ever told, praised for its intricate plotting, atmospheric artwork, and deep character studies. Its exploration of duality, justice, and the passage of time has made it a seminal work in the Batman mythos, directly inspiring later films such as Christopher Nolan's The Dark Knight.