CryENGINE is a game engine used for the first-person shooter computer game Far Cry. It was originally developed by Crytek as a technology demo for NVIDIA and, when the company saw its potential, it was turned into a game.

When video cards with support for 3.0 pixel and vertex shaders were released, Crytek released version 1.2 of the engine which used some of the capabilities for better graphics. It also uses Polybump, a special way of rendering texture to make them appear bumpy. Unlike Bumpmapping this uses actual polygons instead of layers of texture; this led to games like Farcry being very performance demanding.

Later the company developed Cryengine version 1.3, which added support for HDR lighting.

The engine has been licensed to NCSoft for their forthcoming MMORPG, Aion.