巴萨德冲压发动机（Bussard ramjet）是1960年代物理学家罗伯特·巴萨德（Robert W. Bussard）所构想的一种理论航天器推进设计，并因为在拉瑞·尼文（Larry Niven）所着系列丛书《已知宇宙》（Known Space）中被提及而广为所知。除此之外，此概念也曾在卡尔·萨根的科普电视影集《宇宙》（Cosmos: A Personal Voyage）中被提及。

这种推进器是一种核聚变冲压发动机，它利用巨大的电磁场（直径从数公里至数千公里不等）作为漏斗来收集并压缩星际物质中的氢，飞行器的高速将待反应物质强迫推入磁场中，直到压缩的程度到达足以发生核聚变。物质转变之后产生的巨大能量透过磁场导引至发动机的排气方向（其方向与预计的行进方向颠倒），并透过反作用力的原理推进飞行器加速前进，而达到星际飞行的目的。

The Bussard ramjet is a theoretical method of spacecraft propulsion proposed in 1960 by the physicist Robert W. Bussard, popularized by Poul Anderson's novel Tau Zero, Larry Niven in his Known Space series of books, Vernor Vinge in his Zones of Thought series, and referred to by Carl Sagan in the television series and book Cosmos. Bussard ramscoops are also seen in Star Trek, where they are situated at the glowing tips of the warp drive nacelles of spacecraft, although the hydrogen is not used as nuclear fuel.