X2

X2 may refer to:

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• X2, a 2003 movie also known as X-Men United
• Bell X-2, an experimental supersonic aircraft
• Trieste II, the US Navy bathyscaphe based on the Trieste, and called X-2
• Final Fantasy X-2, a video game
• ', another video game
• X2 (Chipset), the standard chipset for 56k downstream modem communications
• X2 train, used for X2000 train system in Sweden
• SpaceShipOne flight 17P, the second Ansari X Prize flight, which is also known as X2.
• ', or xXx 2 or X2
• Skycycle X-2 - Evil Knievel's rocket
• Athlon 64 X2 The Athlon 64 X2 Processor

Additionally, X² may refer to:

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• an algebraic square
• the Chi-square distribution in statistical analysis