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

• XXXX (disambiguation)
• Forex, or Foreign exchange market
• Castlemaine XXXX, an Australian beer brand
• Four-cross, a style of mountain bike racing
• Fourcross, a style of four-wheel downhill racing

This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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