Haxe is an open-source high-level multiplatform programming language and compiler that can produce applications and source code for many different platforms from a single code-base.

Code written in the Haxe language can be source-to-source compiled into Adobe Flash applications, JavaScript programs, C++ standalone applications (to some extent), PHP, Apache CGI, and NodeJS server-side applications.

Haxe was developed by Nicolas Cannasse and other contributors, and was named Haxe because it was short, simple, and "has an X inside", which the author humorously asserts is necessary to make any new technology a success.