X4
# X4

X4, X-4 or x4 may refer to:

* BMW X4, a German crossover automobile
* Sehol X4, a Chinese crossover automobile
* Honda X4, a Japanese motorcycle
* Moto X4, an Android Smartphone
* Mega Man X4, a video game
* Naish X4, a kitesurfing kite
* The Norteños street gang
* Northrop X-4 Bantam, an early jet age research aircraft
* A common name for petroleum ether
* A four-lane PCI Express slot
* Ruhrstahl X-4, a German World War II air-to-air guided missile
* Ultimate X4, a comic-book crossover in the Ultimate Marvel Universe
* X4 (New York City bus), an express bus route
* Stagecoach Gold bus route X4, a bus route in the United Kingdom
* X4 virus, a T-cell tropic HIV
* X-Men Origins: Wolverine, a 2009 film
* X-Men: Days of Future Past, a 2014 film
* WordPerfect X4, a version of word processing software
* X4: Foundations, a 2018 video game
