折叠车是可折叠的自行车，俗称小折，大小从12寸到26寸不等，最常见的是16寸、20寸的。折叠车一般重量从8.5kg到15kg不等，可以携带至公交车、地铁、火车上，常被用作公园休闲，或者短途郊游等等，也有将折叠车进行长途旅行的。到达目的地后继续展开折叠车使用。折叠车比较著名的品牌有大行(DAHON)、BROMPTON、速立达(STRiDA)、Bikedna、Birdy、太平洋自行车、蒙特奇(MONTAGUE)等。

最小的折叠车是A-bike。

A folding bicycle is a bicycle designed to fold into a compact form, facilitating transport and storage. When folded, the bikes can be more easily carried into buildings and houses or on public transportation (facilitating mixed-mode commuting and bicycle commuting), and more easily stored in compact living quarters or aboard a car, boat or plane.