Virtua Fighter 4 (バーチャファイター４) is a fighting game developed by Sega-AM2 and released for Sega NAOMI 2 arcade hardware in 2001. It is the fouth major entry in the Virtua Fighter series and a direct sequel to Virtua Fighter 3. The game was originally announced under the working title of Virtua Fighter X, before appearing with its final name at AOU Show 2001.

The game changed the Japanese arcade landscape due to use of internet and physical cards to save progress, which was the VF.NET (later ALL.Net) system.

It was succeeded by Virtua Fighter 5 in 2005.