A mobile office is an office in a truck, or a purpose built shipping container. Mobile offices are often found on construction sites, or at disaster scenes where a temporary office space is needed. Typically, mobile offices in North America feature a single phase split (240 volt center-tapped) electric service that is connected to a nearby source of power, to run small window-unit air conditioners, and the like.

Mobila office is also used for the workspace of salespeople or similar, working out of their company office. They are usually equipped with a portable computer and connect to the company servers and Intranet via mobile phones, WiFi or via fixed connections in cybercafes, hotels or airport. Since they must carry their equipment, mobile office workers push for miniaturization of devices.