Carsharing or car-sharing (in the UK known as car clubs) is a model of car rental where people rent cars for short periods of time, often by the hour. They are attractive to customers who make only occasional use of a vehicle, as well as others who would like occasional access to a vehicle of a different type than they use day-to-day. The organization renting the cars may be a commercial business or the users may be organized as a democratically controlled company, public agency, cooperative, ad hoc grouping. Today there are more than one thousand cities in the world where people can carshare.

The term "carsharing" is also used for carpooling or ride sharing in some places.

The term carsharing (earlier often written as two separate words, and still today occasionally hyphenated) is now the widely accepted international term. Synonyms include coche compartido en tu barrio in Spanish, autodelen in Dutch, autopartage in French, bildeling in Danish, automobile condivisa in Italian and bilpool in Swedish. In the United Kingdom the term "car clubs" is used, while "car sharing" is also used to refer to ride sharing.