SDU

SDU is a three-letter abbreviation that may refer to:
*Special Detective Unit, Irelands police special branch.
*Santos Dumont Regional Airport, a small busy airport in Rio de Janeiro, Brazil.
*Suleyman Demirel University, University located in Almaty, Kazakhstan.
*Service Data Unit, a telecommunications term related to the layered protocol concept.
*Special Duties Unit, a paramilitary police unit of the Hong Kong Police.
*Social Development Unit, a matchmaking agency in Singapore.
*University of Southern Denmark, Danish: Syddansk Universitet (SDU).
*Southern Diving Unit, a bomb disposal diving unit in the Royal Navy (UK).
*Social Democratic Union (Serbia), a political party in Serbia.
*Social Democratic Union (BiH), a political party in Bosnia and Herzegovina.
*Special Delivery Unit, a small administrative unit of Thai Gov. such as Public Relation Department.
* Sword Dance Union, an organisation which represents the interests of the Rapper Sword and Long Sword dancing traditions.
*Shandong University, a university in Shandong，China.