Rail Cannon may refer to:
- The enemy ability from Final Fantasy XI.
- The enemy ability from Final Fantasy XIII.
- The enemy ability from Final Fantasy Record Keeper.
railgun or rail cannon is an electrically powered electromagnetic projectile launcher based on similar principles to the homopolar motor. A railgun comprises a pair of parallel conducting rails, along which a sliding armature is accelerated by the electromagnetic effects of a current that flows down one rail, into the armature and then back along the other rail.A