Tumbling, sometimes referred to as power tumbling, is a gymnastics discipline in which participants perform a series of acrobatic skills down a 25 metres (82 ft) long rod floor. Each series, known as a pass, comprises eight elements in which the athlete jumps, twists and flips placing only their hands and feet on the track. Tumblers are judged on the difficulty and form of their routine. There are both individual and team competitions in the sport.

Tumbling can also refer more generally to similar acrobatic skills performed on their own or in other gymnastics events, such as in floor exercises or on the balance beam.

Tumbling is governed by the FIG, the International Federation of Gymnastics, and is included as an event within trampoline gymnastics. Although tumbling is not currently an Olympic event, elite tumblers competing at the international level can compete in various events organised by the FIG, continental confederations as well as at the European Games and World Games.

While the origins of tumbling are unknown, ancient records have shown acts of tumbling in many parts of the world including China, India, Japan, Egypt and Iran. Tumbling became part of the educational system of ancient Greece, from which early Romans borrowed the exercise for use in military training. During the Middle Ages, minstrels incorporated tumbling into their performances, and multiple records show tumblers performed for royal courts for entertainment. The 13th-century poem Our Lady's Tumbler depicts one such performer tumbling as an act of devotion. It is towards the end of this period in 1303 that the verb tumble is first attested in this sense in English. There was renewed interest in formalised physical education during the Renaissance, and shortly thereafter gymnastics began to be introduced into some physical education programmes, such as in Prussia as early as 1776. The FIG was officially formed in 1881, then known as the European Gymnastics Federation. Tumbling, however, was not governed by the FIG until 1999. Before this time, the International Trampoline Federation governed the sport since its founding in 1964. National federations have even longer histories, such as the Amateur Athletic Union of the United States which included tumbling in events as early as 1886.

Tumbling has only been included as an official event in one Olympic games, the 1932 Summer Olympics, and was exclusively a men's event. It was around this time that the floor exercise, which includes many elements of tumbling, became an individual event at the Olympics.

Tumbling has been an event at the World Games since the event's founding in 1980, first appearing at the 1981 World Games.

The Amateur Athletic Union of the United States has included tumbling since 1886 and added women's tumbling in 1938.

The National Collegiate Athletic Association previously included tumbling as an event, but removed it in 1962 to emphasise artistic gymnastics. More recently in 2019 the NCAA recommended acrobatics and tumbling be added as a sport to the Emerging Sports for Women program, and this addition became official in the 2020–21 school year.