Hitman is a stealth video game series developed by the Danish company IO Interactive. Previously published by Eidos Interactive, and currently published by Square Enix, the series is available on Microsoft Windows as well as several video game consoles, including the Xbox, PlayStation 2, GameCube, Xbox 360 and PlayStation 3. The game series has since expanded into a novel, Hitman: Enemy Within written by William C. Dietz, followed by Hitman: Damnation which is an official prequel to the installment, Absolution, and a Hitman film adaptation in 2007, which is loosely based on the storyline of the games. The film was negatively received, but became a financial success. Another film, Hitman: Agent 47 was released in 2015, to negative reviews.

The story revolves around Agent 47 (usually simply referred to as "47" or "Mr. 47"), a cloned assassin-for-hire, whose flawless record places him in high demand among the wealthy and elite. The first original scriptwriter was Morten Iversen, who wrote the scripts for Hitman: Codename 47 and Hitman 2: Silent Assassin. He also contributed to Hitman: Contracts and Hitman: Blood Money. The games feature a mix of orchestral and electronica musical scores, composed by Jesper Kyd. A fifth installment of the series, Hitman: Absolution, was released on November 20, 2012. With it, a spin-off has been released for PC, PlayStation 3 and Xbox 360 called Hitman Sniper Challenge. For mobile and tablet, a spin-off game developed by Square Enix Montréal was released and it is a turn-based strategy game, called Hitman Go. There is another game released for mobile called Hitman: Sniper which has first person sniping gameplay. The sixth game, titled Hitman, is slated to be released episodically, the first of which released in March of 2016.