Diu (Traditional Chinese: Hong Kong coinage: 𨳒 [門+小] jyutping: diu2 pinyin: diǎo) is a common profanity in Cantonese. It can be regarded as the Cantonese equivalent of the English fuck. In Mandarin, it is equivalent to the English "dick".

Diu is a city in Diu district in the state of Daman & Diu, India. It is an island lying off the south coast of Gujarat's Kathiawar peninsula, separated from the mainland by a tidal creek. It has an area of 40 km², and a population of 44,110 (2001 census).

Depth Interface Unit. USB device interfacing a depth encoder, analogue and digital inputs to a logging system.

Digital Interface Unit. Device used in Astro or mixed-mode Astro systems for encryption/decryption of audio to/from the console or MBeX.

Digital Interface Unit. See Indoor Unit.

Equipment that provides a modem-like application on the PBX on a station line of the system