Race walking, or racewalking, is a long-distance discipline within the sport of athletics. Although a foot race, it is different from running in that one foot must appear to be in contact with the ground at all times. Race judges carefully assess that this is maintained throughout the race. However, if there is an argument between referee, a replay video must be reviewed to judge accordingly. Typically held on either roads or running tracks, common distances range from 3,000 metres (1.9 mi) up to 100 kilometres (62.1 mi).

The current race walking contests at the Summer Olympics are the 20 kilometres race walk (men and women) and the marathon race walk mixed relay, the latter of which debuted at the 2024 Summer Olympics. The 50 kilometres race walk (men only) was discontinued after the 2020 Summer Olympics. The biennial World Athletics Championships also features both 20 and 50 kilometer events, the 50 km walk for women being contested until 2019. The 50 km race walk was replaced by the 35 kilometres race walk as standard championship discipline in 2022. The IAAF World Race Walking Cup, first held in 1961, is a stand-alone global competition for the discipline and it has 10 kilometres race walks for junior athletes, in addition to the Olympic-standard events. The IAAF World Indoor Championships featured 5000 m and 3000 m race walk variations, but these were discontinued after 1993. Top-level athletics championships and games typically feature 20 km racewalking events.

The sport emerged from a British culture of long-distance competitive walking known as pedestrianism, which began to develop the ruleset that is the basis of the modern discipline around the mid-19th century. Since the mid-20th century onwards, Russian and Chinese athletes have been among the most successful on the global stage, with Europe and parts of Latin America producing most of the remaining top-level walkers. However, it has been particularly affected by doping, with many Russian world and Olympic champions testing positive for banned performance-enhancing drugs.

Compared to other forms of foot racing, stride length is reduced; to achieve competitive speeds racewalkers must attain cadence rates comparable to those achieved by running.

There are only two rules that govern race walking. The first dictates that the athlete's back toe cannot leave the ground until the heel of the front foot has touched. Violation of this rule is known as loss of contact. The second rule requires that the supporting leg must straighten from the point of contact with the ground and remain straightened until the body passes directly over it. These rules are judged by the unaided human eye. Athletes regularly lose contact for a few milliseconds per stride, which can be caught on film, but such a short flight phase is said to be undetectable to the human eye.

Athletes stay low to the ground by keeping their arms pumping low, close to their hips. If one sees a racewalker's shoulders rising, it may be a sign that the athlete is losing contact with the ground. What appears to be an exaggerated swivel to the hip is, in fact, a full rotation of the pelvis. Athletes aim to move the pelvis forward and to minimize sideways motion in order to achieve maximum forward propulsion. Speed is achieved by stepping quickly with the aim of rapid turnover. This minimizes the risk of the feet leaving the ground. Strides are short and quick, with pushoff coming forward from the ball of the foot, again to minimize the risk of losing contact with the ground. World-class race walkers (male and female) can average under 4 and 5 minutes per kilometre in a 20 km race walk (12 to 15 kilometers per hour or 7.5 to 9 miles per hour).

Races have been walked at distances as short as 3 kilometres (1.9 mi) at the 1920 Summer Olympics, and as long as 100 km (62.1 mi). The men's world record for the 50-mile race walk is held by Israeli Shaul Ladany, whose time of 7:23:50 in 1972 beat the world record that had stood since 1935. The modern Olympic events are the 20 km (12.4 mi) race walk (men and women) and 50 km (31 mi) race walk (men only). One example of a longer race walking competition is the annual Paris-Colmar which is 450 to 500 km. Indoor races are 3000 m and 5000 m.

There are judges on the course to monitor the form. Three judges submitting "red cards" for violations results in disqualification of the competitor. There is a scoreboard placed on the course so competitors can see their violation status. If the third violation is received, the chief judge removes the competitor from the course by showing a red paddle. For monitoring reasons, races are held on a looped course or on a track so judges get to see competitors several times during a race. A judge could also "caution" competitors in danger of losing form by showing a paddle that indicates either losing contact or bent knees. No judge may submit more than one card for each walker. The chief judge's job is only to disqualify the offending walker and may not submit any caution cards. Disqualifications are routine at the elite level, such as the famous case of Jane Saville, disqualified within sight of a gold medal in front of her home crowd in the 2000 Summer Olympics, or Lü Xiuzhi, disqualified 20 metres before the finish line at the 2017 World Championships in Athletics.