Tony Hawk's Underground 2 is a 2004 skateboarding video game from Activision, the sixth entry in the Tony Hawk's series after Tony Hawk's Underground (2003). It was developed by Neversoft released on October 4, 2004 in the U.S. for the PlayStation 2, Xbox, GameCube, Microsoft Windows, and Game Boy Advance platforms. Mobile phone versions for BREW and J2ME devices was also released, as well as a PlayStation Portable version the following year subtitled Remix, which includes extra levels and characters.

Tony Hawk's Underground 2 received generally positive reviews, with praise for its gameplay, aesthetics and classic mode, but criticism for its story and lack of innovation.