Jonathan Blow (born 1971) is an American video game designer and programmer, who is best known as the creator of the independent video games Braid (2008) and The Witness (2016), both of which were released to critical acclaim.

In September 2014, Blow began work on a new programming language called "JAI" based on ideas he had previously expressed about video game development. It is aimed at "low-friction" and fluid development, whilst directly supporting data-oriented design for high performance. The language is currently active, but is a work-in-progress, as no JAI compiler has been publicly released yet. A small demo of the language was shown at Reboot Development 2017. Blow also uses Twitch to regularly stream demonstrations of new language features as well as improvements to the game engine that will be bundled with the language.