UDT

UDT may refer to:

  • Underwater Demolition Team, American commando team and the precursor to the U.S. Navy SEALs
  • Chadian Democratic Union (Union Démocratique Tchadienne), the second African political party ever created in Chad
  • Timorese Democratic Union (União Democrática Timorense), a conservative political party in East Timor
  • UDP-based Data Transfer Protocol, a high performance data transport protocol and its open source library
  • Uitgeverij De Tijd, a former Belgian publisher
  • Unarmed Defensive Tactics, as employed by various Police Forces as part of their training
  • Undescended testes, a developmental abnormality in which the testes do not properly descend into the scrotum
  • Union of Djibouti Workers, a trade union centre in Djibouti
  • Universal Diver Training, a SCUBA diver training organization
  • User-defined tag, a concept in Financial Information eXchange protocol to help customize messaging between various parties
  • User-defined type, a concept in computer science that is generally synonymous with "record", "structure", "composite type" or "class"
  • Yonkers UDT, a sport scuba diving club in Yonkers, New York, USA