曲速引擎（英文：Warp drive）是一种假想的超光速（faster-than-light, FTL）推进系统，经常出现于科幻小说的设定中，尤以在影片《星际旅行》中最为常见。一架装载着曲速引擎的宇宙飞船，可以以快于光速的几个数量级的速度航行，同时又回避了时间膨胀的相对论性的问题。与其他科幻作品的超光速技术（比如跳跃引擎、银河便车指南系列中的无限不可能引擎）不同，曲速引擎并不允许在两点间进行瞬时旅行；曲速引擎技术在宇宙飞船周围创造出了一种正常时空的人工“气泡”。（这与进入独立的区域或维度截然相反，比如出现在星际大战、星际之门、战锤40000、巴比伦5号中的超空间）所以，以曲速速率航行的宇宙飞船在“正常时空”中仍能继续与物质相互作用。

Warp drive is a faster-than-light (FTL) spacecraft propulsion system in many science fiction works, most notably Star Trek. A spacecraft equipped with a warp drive may travel at fantasy speeds greater than that of light by many orders of magnitude. In contrast to other FTL technologies such as a jump drive or hyper drive, the warp drive does not permit instantaneous (or near instantaneous) travel between two points but involves a measurable passage of time which is problematic to the concept. Spacecraft at warp velocity theoretically continue to interact with objects in "normal space". Other science fiction in which warp drive technology is featured include Stars!, EVE Online, Earth and Beyond, StarCraft, DarkSpace, Starship Troopers, Doctor Who, WALL-E, FTL: Faster Than Light and Star Ocean. The general concept of "warp drive" was introduced by John W. Campbell in his 1931 novel Islands of Space. A similar concept known as the "hyperdrive" in the science fiction franchise Star Wars functions also in a similar manner by manipulating the dimensions of spatial vacuum in front of a spaceship and behind it, giving it immense speed by giving it around and slightly beyond light speed capability.