Windows Mixed Reality is a mixed reality platform introduced as part of the Windows 10 operating system, which provides augmented reality and mixed reality experiences with compatible head-mounted displays.

Its flagship device, Microsoft HoloLens, was announced at the "Windows 10: The Next Chapter" press event on January 21, 2015 It provides a mixed reality experience where a live presentation of physical real-world elements is incorporated with that of virtual elements (referred to as "holograms" by Microsoft) such that they are perceived to exist together in a shared environment. A variant of Windows for augmented reality computers (which augment a real-world physical environment with virtual elements) Windows Mixed Reality features an augmented-reality operating environment in which any Universal Windows Platform app can run.

The platform is also used for virtual reality headsets designed for use on the Windows 10 Fall Creators Update, which are built to specifications implemented as part of Windows Mixed Reality, but lack support for augmented-reality experiences.