Tony Hawk's Underground is a 2003 skateboarding video game and the fifth entry in the Tony Hawk's series after Tony Hawk's Pro Skater 4. It was developed by Neversoft and published by Activision in 2003 for the GameCube, PlayStation 2, Xbox, and Game Boy Advance. In 2004, it was published for Microsoft Windows in Australia and New Zealand as a budget release.

Tony Hawk's is a skateboarding video game series published by Activision and endorsed by the American professional skateboarder of the same name. The series was primarily developed for home consoles by Neversoft with an annual release schedule from launch to 2007, until Activision transferred the franchise to Robomodo in 2008, who developed the franchise on a non-annual release basis until 2015 when Activision and Hawk's license expired, leaving the future of the series uncertain. In 2020, the series returned under Activision with a remake of the original two games in the series, with development handled by Vicarious Visions. The series has spawned a total of 20 games.