SteamOS is the primary operating system for the Steam Machine gaming platform and Steam Deck hybrid video game console by Valve.

The initial version of SteamOS, including 1.0 and 2.0 were based on Debian 8.0. In July 2021, Valve announced the Steam Deck, a hybrid video game console running SteamOS 3.0, which is a Arch Linux distribution with a KDE Plasma 5 desktop.