Meta Horizon OS, previously known informally as Meta Quest Platform or Meta Quest OS, is an Android-based extended reality operating system for the Meta Quest line of devices released by Meta Platforms. Initially developed for the embedded operating system on the Oculus Rift and Oculus Rift S, the platform has been based on the Android operating system since the release of the Oculus Go in 2018. It first supported augmented reality via grayscale camera passthrough upon the release of the Oculus Quest in 2019, and has supported color passthrough since the release of the Meta Quest Pro in 2022.
On April 22, 2024, the company announced that the platform would be rebranded as Meta Horizon OS.