Freestyle motocross (also known as FMX) is a variation on the sport of motocross in which motorcycle riders attempt to impress judges with jumps and stunts.

The two main types of freestyle events are:

• Big air (also known as "best trick"), in which each rider gets two jumps — usually covering more than 75 ft (22.8 m) — from a dirt-covered ramp. A panel of judges evaluates the style, trick difficulty, and originality and produces a score on a 100-point scale. Each rider's highest single-jump score is compared; top score wins.
• Freestyle motocross, the older of the two events, in which riders perform two routines, each lasting between 90 seconds and 14 minutes, on a course consisting of multiple jumps of varying lengths and angles that generally occupy one to two acres (.4 to .8 hectares). Like big air, a panel of judges assigns each contestant a score based on a 100-point scale, looking for difficult tricks and variations over jumps.

Notable freestyle motocross events include Red Bull X-Fighters, NIGHT of the JUMPs, the X Games, Gravity Games, Big-X, Moto-X Freestyle National Championship, and Dew Action Sports Tour. Freeriding is the original form of freestyle motocross which started in the hills of southern California; due to professional racers such as Jeremy McGrath and Phil Lawrence "play riding" in the hills of reche canyon. It has no structure, and is traditionally done on public land. Riders form natural jumps and drop-offs to execute their tricks on. Some freeriders prefer to jump on sand dunes. In many ways, freeriding requires more skill and mental ability. Notable freeriding locations include Ocotillo Wells, Glamis Dunes and Beaumont in California, and Caineville, in Utah.