Need for Speed: Underground 2 (NFSU2) is a multiplatform racing video game published and developed by Electronic Arts. Released in 2004, it is the sequel to Need for Speed: Underground, and is part of the Need for Speed series, available on GameCube, PlayStation 2, Xbox, Nintendo DS, Game Boy Advance and Windows. It was developed by EA Black Box.

The game is based around tuning cars for street races, resuming the Need for Speed: Underground storyline. Need for Speed: Underground 2 provides several new features, such as a broader customization, new methods of selecting races, the "explore" mode (just driving around freely, similar to Grand Theft Auto, in a large city known as "Bayview"). Underground 2 also introduces several SUVs, which could be customized as extensively as other Underground 2 vehicles and used to race against other SUV racers. Brooke Burke is the voice of Rachel Teller, the person who guides you through the story.

On the Nintendo DS installment, users are able to design custom decals to adorn any vehicle in the game.

The PSP equivalent is Need for Speed: Underground Rivals.