Kenneth Lane "Ken" Thompson (born February 4, 1943), commonly referred to as ken in hacker circles, is an American pioneer of computer science. Having worked at Bell Labs for most of his career, Thompson designed and implemented the original Unix operating system. He also invented the B programming language, the direct predecessor to the C programming language, and was one of the creators and early developers of the Plan 9 operating systems. Since 2006, Thompson has worked at Google, where he co-invented the Go programming language.

Ken Thompson (né Kenneth Lane Thompson le à La Nouvelle-Orléans) est un informaticien américain, concepteur des systèmes UNIX et Plan 9 ainsi que des langages B et Go.