A power user is a user of computers, software and other electronic devices, who uses advanced features of computer hardware, operating systems, programs, or websites which are not used by the average user. A power user may not have extensive technical knowledge of the systems they use[6] and may not be capable of computer programming or system administration, but is rather characterized by the competence or desire to make the most intensive use of computer programs or systems.

In enterprise software systems, "Power User" may be a formal role given to an individual who is not a programmer, but who is a specialist in business software. Often these are people who retain their normal user job role, but also function in testing, training, and first-tier support of the enterprise software.

Users may erroneously label themselves as power users when they are less than fully competent.

Some software applications are often regarded as particularly suited for power users, and may even be designed as such, due to their inclusion of sophisticated function and feature sets not typically found in other comparable applications. Examples include VLC media player, a multimedia framework/player/server, which includes a complex, feature-rich, and highly customizable interface (and multiple interfaces moreover, beyond simple skinning) with numerous built-in capabilities not typically deemed useful or even understandable to users in the context of other media player suites such as Windows Media Player or iTunes, and not required by programmers, who can often write a script using a library more easily than interacting with a complex application program such as VLC.