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The long jump is a track and field event in which athletes combine speed, strength, and agility in an attempt to leap as far from the take-off point as possible.

Competitors run down a runway (usually coated with the same rubberized surface as running tracks, crumb rubber also vulcanized rubber) and jump as far as they can from behind a foul line (commonly referred to as the "board", and usually defined by the trailing edge of a takeoff board embedded flush with the runway surface, or a painted mark on the runway) into a pit filled with finely ground gravel or sand. The distance traveled by a jumper is often referred to as the "mark" because it is the distance to the nearest mark made in the sand from the foul line. If the competitor starts the leap with any part of the foot past the foul line, the jump is declared illegal and no distance is recorded. At the elite level, a layer of plasticine is placed immediately after the board to detect this occurrence. Otherwise, an official (similar to a referee) will watch the jump and make the determination. The competitor can initiate the jump from any point behind the foul line; however, the distance measured will always be from the foul line. Therefore, it is in the best interest of the competitor to get as close to the foul line as possible.

Usually, each competitor has a set number of attempts (typically three) to make his or her longest jump, and only the longest legal jump counts towards the results. Higher level competitions are split into two rounds: trials and finals. In competitions containing a final round, only a select number of competitors are invited to return for further competition. The number of competitors chosen to return to the final round is determined before the start of the meet by a committee composed of coaches and officials. It is standard practice to allow one more competitor than the number of scoring positions to return to the final round. For example, if a given meet allows the top eight competitors to score points, then the top nine competitors will be selected to compete in the final round. Taking an extra competitor to the final round helps to allow that athlete to move into a scoring position if the competitor can improve on his or her best mark of the competition. Final rounds are viewed as an additional three jumps, as they do not have any priority to those scored in the trial round. The competitor with the longest legal jump (from either the trial or final rounds) at the end of competition is declared the winner. (For specific rules and regulations in United States Track & Field see Rule 185[1]).

There are four main components of the long jump: the approach run, the last two strides, takeoff and action in the air, and landing. Speed in the run-up, or approach, and a high leap off the board are the fundamentals of success. Because speed is such an important factor of the approach, it is not surprising that many long jumpers also compete successfully in sprints. A classic example of this long jump / sprint doubling is performances by Carl Lewis.

The long jump is notable for two of the longest-standing world records in any track and field event. In 1935, Jesse Owens set a long jump world record (of 8.13m) that was not broken until 1960 by Ralph Boston. Later, Bob Beamon jumped 8.90 metres (29 feet, 2-1/2 inches) at the 1968 Summer Olympics at an altitude of 7,349 feet, a jump not exceeded until 1991. On August 30 of that year, Mike Powell of the United States, in a well-known show down against Carl Lewis, leapt 8.95 m (29.4 ft) at the World Championships in Tokyo, setting the current men's world record. Some jumps over 8.95 m (29.4 ft) have been officially recorded (8.99 m/29.5 ft by Mike Powell himself, 8.96 m/29.4 ft by Iván Pedroso), but were not validated since there was either no reliable wind speed measurement available, or because wind speed exceeded 2.0 m/s. Lewis himself jumped 8.91m just before Powell's record-breaking jump with the wind exceeding the maximum allowed; this jump remains the longest never to win Olympic or World Championship gold. The current world record for women is held by Galina Chistyakova of the former Soviet Union who leapt 7.53 m (24.7 ft) in Leningrad in 1988.