NASCAR SimRacing, abbreviated NSR, is a computer racing simulator developed by EA Tiburon and released on February 15, 2005, by EA Sports for Microsoft Windows.

The game features a single-player career mode as well as multiplayer online gameplay.

While a large number of real drivers are present in the Cup, Busch and Truck Series in NASCAR SimRacing, fantasy drivers are still present, sponsored by fictional or unused sponsors.

A patch is available at installation to download the 2005 NEXTEL Cup cars as a separate mod.

In October 2006 EA Sports shut down the GameSpy multiplayer servers.