《银河便车指南》（The Hitchhiker's Guide to the Galaxy，中国大陆译作《银河系漫游指南》，台湾译作《银河便车指南》）是由英国作家道格拉斯·亚当斯所写的一系列科幻小说，1978年在英国国内电台BBC Radio 4以广播剧的形式首次出现，接着在首次发表后几年间以许多其他形式出现，如:

2005年美国好莱坞斥资在英国拍摄了电影《星际大奇航》，于2005年四月上映。2004年至2005年英国将最后三本小说以广播的形式播出。几乎所有小说、游戏、甚至电影、舞台剧的草稿皆出自道格拉斯·亚当斯之手。

The Hitchhiker's Guide to the Galaxy (sometimes referred to as HG2G, HHGTTG or H2G2) is a comedy science fiction series created by Douglas Adams. Originally a radio comedy broadcast on BBC Radio 4 in 1978, it was later adapted to other formats, including stage shows, novels, comic book adaptations, a 1981 TV series, a 1984 computer game, and 2005 feature film. The Hitchhiker's Guide to the Galaxy has become an international multi-media phenomenon. The novels are the most widely distributed, having been translated into more than 30 languages by 2005.