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Plan 9 from Outer Space, a science fiction film directed by Ed Wood, Jr.

Plan 9 from Bell Labs, an operating system developed by Bell Laboratories as Unix's successor.

Plan 9 from User Space, a port of many Plan 9 from Bell Labs libraries and applications to Unix-like operating systems

Plan 9 (record label), an independent record label owned by Glenn Danzig

Plan 9 (surf band), a surf rock band from Berlin

Plan 9 Music, a record store chain with retail outlets located in several Virginian college towns

Plan 9 Publishing, a web comics publisher

Plan9 (comics), a Costa Rican comics magazine

Plan 9 Channel 7 is a song on the 1979 album Machine Gun Etiquette by punk group The Damned

Plan 9 was the name used by the group Breaking Benjamin for a short time until they came up with their current name.