In Unix computing, Window Manager Improved (WMI), is a lightweight window manager for the X Window System. It was started in late 2003, and it attempts to combine the best features of LarsWM, Ion (X window manager), Evilwm and Ratpoison. It also bills itself as the Vi of window managers, as it has two modes as in vi, a normal mode and a command mode. In the command mode, one uses the keyboard to execute various commands such as to invoke programs or configure the window manager.

A complete rewrite, dubbed wmii, is intended to reduce resource usage and improve performance, and to improve rendering capabilities, modularity, configuration, and uses a new IPC interface inspired by 9P.

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