The Lightweight Java Game Library (LWJGL) is an open-source Java software library that provides bindings to a variety of C and C++ libraries for video game developers. It exposes high performance cross-platform libraries commonly used in developing video games and multimedia titles, such as Vulkan, OpenGL, OpenAL and OpenCL. It further provides access to controllers, steering wheels and joysticks in a platform-neutral way.

The primary goal of the project is to provide a way for Java developers to get access to resources that are otherwise unavailable or poorly implemented on the existing Java platform. The main philosophy is to expose underlying technology as a thin wrapper, thus creating an API close to the original. It is also the basis of many high-level Java game engines and libraries, such as libGDX or the jMonkeyEngine.

LWJGL is available under a BSD license.

On 13 November 2014, version 3 was announced, which was released in alpha version on 27 April 2015 and is a complete rewrite of LWJGL. Many new bindings, including GLFW, EGL and Objective-C, were added. Support for Oculus Rift development was also added with LibOVR bindings. The new version was released on 4 June 2016, after more than 3 and a half years in development.