Angry Video Game Nerd (frequently abbreviated as AVGN; originally known as The Angry Nintendo Nerd) is an American retrogaming review comedy web series starring and created by James Rolfe. The series centers on Rolfe's titular skit character, often simply shortened to "the Nerd" (sometimes just "Nerd"), a short-tempered and foul-mouthed gamer who delivers commentary on retro games of poor quality. While the series began with Rolfe simply playing games while providing retrospective commentary, the show has grown in scope to encompass sketches featuring guest characters, reviews of gaming consoles and peripherals, and short lectures about video game history and culture.

Starting out as an amateur filmmaker, Rolfe intended his earliest videos of the character to be a joke privately shown amongst friends and colleagues. In May 2004, Rolfe, at the suggestion of future series producer Mike Matei, put the Angry Nintendo Nerd videos on his website, and in 2006 on the emerging video streaming platform YouTube, where it gained popularity. The series became a cult success, and Rolfe began appearing as the character in various other media such as a feature-length film and video games, and many public appearances. The series was soon renamed to The Angry Video Game Nerd to avoid trademark issues with Nintendo, and to allow Rolfe to review games from non-Nintendo consoles. From 2007 to 2011, the series entered a distribution deal with popular gaming websites ScrewAttack and GameTrailers, and briefly with streaming service Amazon Video in 2018.

The Angry Video Game Nerd is considered one of the pioneers of internet review videos, being highly influential on the style and format of subsequent video reviewers as well as being responsible for helping to bring the concept into the mainstream. Various media review/sketch comedy entertainers have since cited the show as inspiration for their own material, such as JonTron, Doug Walker, Egoraptor, Angry Joe, Scott Wozniak, and Joueur du Grenier, among others.