Ctwm is a window manager for the X Window System. It provides titlebars, shaped windows, virtual screens (workspaces), several forms of icon management, user-defined macro functions, click-to-type and pointer-driven keyboard focus, and user-specified key and pointer button bindings.

It is actually twm (Tab Window Manager) from the MIT X11 distribution slightly modified to accommodate the use of several virtual screens (workspaces). It is heavily inspired from the Hewlett-Packard vuewm window manager. In addition, ctwm can use coloured, shaped icons and background root pixmaps in XPM and JPG format, as well as any format understood by the imconv package [from the San Diego Supercomputer Center] and xwd files. Ctwm can be compiled to use both, either or none of the above icon/pixmap formats.