Snowboard Cross (sometimes referred to as Boarder Cross ) is a snowboard competition in which a group of racers (usually four or more) start simultaneously atop an inclined course, then attempt to reach the end of the course first.

The course is typically quite narrow and includes cambered turns, gap jumps, berms, drops, and steep and flat sections designed to challenge the riders' ability to stay in control. It is not uncommon for racers to collide with each other. Some observers have compared the sport to short track speed skating because of the amount of contact involved. The name and the riders' full-face helmets show the sport's influence by motocross.

Snowboard cross was created by Steven Rechtschaffer, and the first course was created on Whistler Blackcomb during 1990.

Skiercross or skier-X is a relatively new type of skiing competition. Despite it being a timed racing event, it is often considered part of the new school movement of freestyle skiing because it incorporates terrain features traditionally found in freestyle.

In a time trial or qualification round, every competitor skis down the course, which is built to encompass both naturally occurring terrain and manmade features like jumps, rollers, banks — whatever the course builder can imagine. After the time trial, the fastest 16 (in women's events) or 32 skiers (in men's events) compete in a knockout (KO)-style series in rounds of four. A group of four skiers start simultaneously and attempt to reach the end of the course. The first two to cross the finish line will advance to the next round.

Competitors are not allowed to pull or push each other during the KO finals. Any intentional contact to the other competitors will be penalized by disqualification or exclusion from the next race.

The International Ski Federation (FIS)'s Freestyle Skiing World Cup has recently added skicross competitions to its calendar in addition to moguls and aerials.

The International Olympic Committee decided on November 28, 2006 to include Skicross in the program of the 2010 Winter Olympics at Vancouver.