Gankutsuou: The Count of Monte Cristo is a Japanese anime television series produced by Gonzo. It is a science fiction adaptation of the 1844 novel The Count of Monte Cristo by Alexandre Dumas. The 24-episode series aired on Japanese television between October 2004 and March 2005. It was licensed for a Western release first by Geneon Entertainment and later by Funimation. The series was adapted into a CD drama, a trilogy of novels by screenwriter Shuichi Kouyama, and a manga series written and drawn by series creator Mahiro Maeda, with additional story elements written by Yura Ariwara which ran from 2005 to 2008.

Set in the year 5053, the series focuses on the impact of the titular Count: formerly a sailor named Edmund Dantes, he was betrayed by his friends and imprisoned on false charges. Aided by a mysterious force dubbed "Gankutsuou", Dantes escaped and refashioned himself as the Count, determined to exact vengeance on those who wronged him. The series is mainly told from the perspective of Viscount Albert de Morcerf, the teenage son of one of the Count's enemies. While the series adapts much of the original storyline and carries over its theme of revenge, the plot and characters feature multiple differences.

Originally intended as an adaptation of The Stars My Destination by Alfred Bester, the copyright holders' refusal to allow an adaptation led Maeda to instead use Dumas's novel, which had parallel themes to Bester's story. Maeda created the story and characters, collaborating on the former with Kouyama and the latter's designs with artist Hidenori Matsubara. The anime's artstyle blended Western Impressionism and Japanese Ukiyo-e styles. Fashion designer Anna Sui collaborated on costume designs. Original music was co-composed by Jean-Jacques Burnel of British band The Stranglers, who also composed and sang the main themes. The series was praised by critics and received multiple accolades.