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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