沙滩车（Dune buggy）是一种主要是在海滩或沙漠等沙地上面行驶的轻量化越野车辆，通常拥有简单轻量化开放式车身结构，扭力充足的引擎，与大尺码的越野胎。沙滩车最早出现于1950年代的美国加州南部，一开始很有可能只是一些业余人士将想要报废的旧车外壳拆掉后，在残存的底盘上装上大型越野胎而做成的改装产品，但之后渐渐开始有专业以特定车款的结构为基础所改造的沙滩车，或是直接生产套件供人组装驾驶。除了民间用途之外，由于机动性优异，沙滩车也经常被政府单位或军方利用，作为恶劣地形区域内的交通工具。

A dune buggy or beach buggy is a recreational motor vehicle with large wheels, and wide tires, designed for use on sand dunes, beaches, or desert recreation. It is called a "Beach Buggy" in the United Kingdom, Ireland and many other English speaking countries. The design is usually a modified vehicle and engine mounted on an open chassis. The modifications usually attempt to increase the power-to-weight ratio by either lightening the vehicle or increasing engine power or both. Dune buggies designed specifically for operation on open sand are called sandrails.