Bobsleigh is a winter sport in which teams make timed runs down narrow, twisting, banked, iced tracks in a gravity-powered sled. In the United States and Canada the sport is known as bobsled.

International bobsleigh competitions are governed by the Fédération Internationale de Bobsleigh et de Tobogganing (FIBT). National competitions are often governed by bodies such as the United States Bobsled and Skeleton Federation and Bobsleigh Canada Skeleton.

The sport of bobsleigh was invented in Switzerland. The first races were run on snow-covered roads, with the opening competition in 1884 at St. Moritz. The first club was formed in 1897, and the first purpose-built track was opened in 1902.

The Fédération Internationale de Bobsleigh et de Tobogganing (FIBT) was founded in 1923. Men's four-crew bobsleigh appeared in the first ever Winter Olympic Games in 1924, and men's two-crew bobsleigh was added in 1932. Bobsleigh was not included in the 1960 Winter Olympics, but has been in every Winter Olympics since. Women's bobsleigh started in competition in the early 1990s, and women's two-crew bobsleigh made its Olympic debut at the 2002 Winter Olympic Games. Bobsleigh is also contested at World, European, and World Cup championships.

Switzerland and Germany have been the most successful bobsleighing nations over European, World, World Cup, and Olympic championships. The Swiss have won more medals than any other nation, and since the 1990s Germans have been dominant in international competition. Italy, Austria and Canada also have strong bobsleigh traditions.