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In Unix computing, Fluxbox is an X window manager based on Blackbox 0.61.1.

It aims to be lightweight and highly customizable, with only minimal support for graphical icons, and only basic interface style capabilities. The basic interface has only a taskbar and a menu accessible by right-clicking on the desktop. Fluxbox also supports user-created keyboard shortcuts.

In accordance with Fluxbox's goal of simplicity, the main menu, the keyboard shortcuts and the basic configuration are all controlled by simple text files, though there are also graphical tools such as Fluxconf available to change settings.

Colors, gradients, borders, and several other basic appearance attributes can be specified; recent versions of Fluxbox support rounded corners and graphical elements. Fluxbox also has several features Blackbox lacks, including tabbed windows, a feature familiar from PWM, and a configurable titlebar.