Black Cat (stylized in all caps) is a Japanese manga series written and illustrated by Kentaro Yabuki. It was originally serialized in publisher Shueisha's shōnen manga magazine Weekly Shōnen Jump from July 2000 to June 2004, with the chapters later collected into twenty tankōbon (bound volumes) by Shueisha. The story centers on a man named Train Heartnet who withdrew from an elite group of assassins called the Chronos Numbers to become a bounty hunter.

The series was adapted into a twenty-four episode anime television series by studio Gonzo, which originally aired on Tokyo Broadcasting System (TBS) from October 2005 to March 2006. The manga was licensed for English-language publication in North America by Viz Media and in Australasia by Madman Entertainment. Funimation Entertainment licensed the anime for an English dub and North American broadcast on their own Funimation Channel, with Madman releasing it in Australasia and MVM Films in the United Kingdom.

In Japan, the Black Cat manga sold over 12 million copies, while in North America several volumes have been featured in weekly top ten lists of best-selling manga. The anime has also been popular in both Japan and North America. Manga and anime critics had praise for Black Cat's action, differing views on the artwork and characters, and mainly negative comments for its plot which has been criticized for having typical elements of shōnen manga (targeted at boys).