X is a commonly used letter often abbreviated to represent a larger term or broader name. It may refer to:
- X-Drive, the name of an unimaginable energy source from Probotector (MD).
- X Bomb, a weapon in Contra: Rogue Corps.
- GX Army, it is unknown what the X stands for. In Contra: Operation Galuga, Bill Rizer jokingly refers it to the roman numeral of "ten".
- X-FLO, the name of a corporation in Contra: Operation Galuga Lucia (and possibly the Contra Unit is involved with.
- X-type artifact, the artifact housed in Galuga Island from Contra: Operation Galuga.
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