过山车（英文：Roller coaster，过山车或又称为云霄飞车）是一种机动游乐设施，常见于游乐园和主题乐园中。拉马库斯·阿德纳·汤普森（LaMarcus Adna Thompson）是第一个注册云霄飞车相关专利技术的人（1865年1月20日），并曾制造过十数个云霄飞车设施，因此被誉称为「重力之父」（Father of Gravity）。一个基本的云霄飞车构造中，包含了爬升、滑落、倒转，其轨道的设计不一定是一个完整的循环，也可以设计为车体在轨道上的运行方式为来回移动。大部分云霄飞车的每个乘坐车厢可容纳2人、4 人或6人，这些车厢利用勾子相互链接起来，就像火车一样。

A roller coaster is an amusement ride developed for amusement parks and modern theme parks. LaMarcus Adna Thompson obtained a patent regarding roller coasters on January 20, 1885, which were made out of wood, but this patent is considerably later than the "Russian mountains" described below. In essence a specialized railroad system, a roller coaster consists of a track that rises in designed patterns, sometimes with one or more inversions (such as vertical loops) that briefly turn the rider upside down. The track does not necessarily have to be a complete circuit, as shuttle roller coasters demonstrate. Most roller coasters have multiple cars in which passengers sit and are restrained. Two or more cars hooked together are called a train. Some roller coasters, notably wild mouse roller coasters, run with single cars.