UDT
UDT is an abbreviation for:
- UDT, " under the title " Note in the literature
- Underwater Demolition Teams, special units of the U.S. Navy and the predecessor of the United States Navy SEALs
- União Democrática Timorense, Conservative Party of East Timor
- User Defined Type that is synonymous with abstract datatype, see Abstract Data Type
- Disambiguation
- Abbreviation