XXXX is a brand of Australian lager beer. It may also refer to:
* Fourecks, a continent in the fictional Discworld
* "XXXX", a song by Hong Kong rap group Lazy Mutha Fucka
* A shortened version of "XXXXL" or "4XL", a plus size clothing size that generally means Extra, Extra, Extra, Extra Large.
* XXXX, an obscuration of the name Xenu in Scientology
* XXXX, the main character in the film Layer Cake
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