VDU may refer to any of the following:
1. Short for visual display unit, VDU is an older British term used to describe any device used with computers to display images. For example, a flat panel display and a projector are both examples of VDUs. However, VDU is most commonly used to describe the CRT monitor, a now archaic standard that has been replaced by flat panel displays.
2. Short for video display unit, VDU is a computing device that allows for input by a user and output to a display, like a computer monitor. A VDU consists of a display device and a keyboard, and could also include a mouse. In the United States, it is sometimes referred to as a video display terminal, or VDT.