此文章涉及了以公共交通为目的的汽车共享。对于私营业主间的分享活动安排，请参见合伙拼车。

汽车共享或者合伙拼车（在英国被称为汽车俱乐部）是一个汽车租赁模式，用于人们短期内租车，往往按小时收费。他们吸引那些只是偶尔使用汽车的顾客，他们愿意偶尔享用不同类型的车，而不愿使用日常用车，一部分的原因则是这些客人都住在公寓，同时没有停车位，另一个则是单纯的开车去上下班的人，使用这种服务可以使车用得更有效率。这些汽车租赁组织有些是商业公司，或是由用户们民主管理的公司，公共机构，合资公司，特设分组。今天，在全球一千多个城市，人们可以共享车辆。所谓“汽车共享”在一些地方也称作拼车或者车辆共乘。

This article deals with the short-term rental of cars. For the shared use of cars by persons with similar travel needs see Carpool.

Carsharing or car sharing (US) or car clubs (UK) 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 company, public agency, cooperative, or ad hoc grouping.