星座计划（Project Constellation）是美国国家航空航天局开发的一项已中止的载人航天太空探索计划。2010年1月28日，美联社报导，美国总统奥巴马已经实际上搁浅了重返月球计划。 同年1月29日，一名白宫太空问题顾问表示，重返月球计划“已死”。有关法案于同年10月成为法律，本计划宣告终结，但相关技术很可能会用于未来的太空探索计划。

整个计划将包括一系列新的航天器、运载火箭以及相关硬件，将在包括国际空间站补给运输以及登月等各种太空任务中使用。大多数星座计划使用的硬件都会基于航天飞机的模式，尽管核心部件猎户座航天器（曾称为载人探索飞行器，Crew Exploration Vehicle，CLV）很大程度上受了阿波罗飞船的影响，使用乘员／服务舱系统。

The Constellation Program (abbreviated CxP) was a human spaceflight program developed by NASA, the space agency of the United States, from 2005 to 2009. The major goals of the program were "completion of the International Space Station" and a "return to the Moon no later than 2020" with a crewed flight to the planet Mars as the ultimate goal. The program's logo reflected the three stages of the program: the Earth (ISS), the Moon, and finally Mars—while the Mars goal also found expression in the name given to the program's booster rockets: Ares (The Greek equivalent of the Roman god Mars). The technological aims of the program included the regaining of significant astronaut experience beyond low Earth orbit and the development of technologies necessary to enable sustained human presence on other planetary bodies.