Other
- UDC Finance Limited, a wholly owned subsidiary of ANZ National Bank, New Zealand
- United Daughters of the Confederacy, an American sororal association dedicated to honoring the memory of those who served and died in service to the Confederate States of America
- Universal Decimal Classification, a system of library classification derived from the Dewey Decimal Classification
- USS Donald Cook (DDG-75), an Arleigh Burke-class destroyer in the United States Navy
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