id Tech 6 is an upcoming OpenGL based game engine under preliminary development by id Software, which will tentatively follow id Tech 5.

Preliminary information given by John Carmack about this engine, which is still in early phases of development, tend to show that id Software is looking toward a direction where ray tracing and classic raster graphics would be mixed. However, he also explained during QuakeCon 08, the hardware that is capable of id Tech 6 did not yet exist.

In July 2011, he explained that id Software is beginning research for the development of id Tech 6.