RallyCross, also known as RallyX, is a type of car competition in the United States and Canada, sanctioned by Sports Car Club of America (SCCA). It is a timed event that involves solo driving on grass or dirt and can be considered "autocross on the dirt." As with autocross, the emphasis is on driver skill and handling rather than absolute speed, with frequent corners generally keeping speeds below 60 mph (100 km/h). In many ways RallyCross is to rally racing as autocross is to road racing.

Autocross is a form of motorsport in which competitors are timed to complete a short course using automobiles on a dirt or grass surface, excepting where sealed surfaces are used in United States. Rules vary according to the governing or sanctioning body, such as the length of the course, the amount of permitted attempts, or whether competitors start the course individually at intervals or at the same time as others. In this latter form, Autocross differs from other forms of motor racing by using a system of heats or alternative timing methods for the classification rather than racing for position and declaring the first across the finish line as the winner.