4X (disambiguation)

4X is a genre of computer strategy games.

4X may also refer to:
 * Sogitec 4X, an audio processor created at IRCAM
 * 4x CD-ROM drive, a speed of CD-ROM drive
 * LG Optimus 4X HD, an Android smartphone
 * NWFB Route 4X, a bus route in Hong Kong
 * 4X, the production code for the 1977 Doctor Who serial Image of the Fendahl
 * Quad scull or quadruple scull in rowing