UDT

UDT may refer to:

Organisations

 * Uitgeverij De Tijd, a former Belgian publisher
 * Underwater Demolition Team, United States Naval reconnaissance and amphibious landing beach demolition unit from which the U.S. Navy SEALs evolved
 * Republic of Korea Navy UDT/SEAL, from the Republic of Korea Navy
 * União Democrática Timorense, (Timorese Democratic Union), a conservative political party in East Timor
 * Union Démocratique Tchadienne, (Chadian Democratic Union), the second African political party in Chad
 * Union of Djibouti Workers, a trade union centre in Djibouti
 * United Dominions Trust, a subsidiary of the former Trustee Savings Bank, merged with Lloyds Bowmaker in 2001

Computing

 * UDP-based Data Transfer Protocol, a high performance data transport protocol and library
 * User-defined type, in computer science that is generally synonymous with "record", "structure", "composite type" or "class"

Technology

 * Urine Diversion Toilet, a toilet system where urine and faeces are separated at source