Planetfall is a science fiction themed interactive fiction video game written by Steve Meretzky, and published in 1983 as the eighth game from Infocom. The original release was for Apple II, Atari 8-bit computers, TRS-80, and IBM PC compatibles. Atari ST and Commodore 64 versions were released in 1985. A version for CP/M was also released. Planetfall was Meretzky's first published game, and it proved one of his most popular works and a best-seller for Infocom. It was one of five top-selling games to be re-released in Solid Gold versions with in-game hints. Planetfall uses the Z-machine originally developed for Zork and was added as a bonus to the Zork Anthology.

Steven Eric Meretzky is an American video game developer. He is best known for creating Infocom games in the early 1980s, including collaborating with author Douglas Adams on the interactive fiction version of The Hitchhiker's Guide to the Galaxy, one of the first games to be certified "platinum" by the Software Publishers Association. Later, he created the Spellcasting trilogy, the flagship adventure series of Legend Entertainment. He has been involved in almost every aspect of game development, from design to production to quality assurance and box design.