Dewey Decimal Classification

Darwin Day Celebration

Doggie Daycare

Hip-hop group Deep Dickollective, also known as D/DC

Dover District Council in Dover (district)

Detroit Diesel Corporation

The U.S. District Court for the District of Columbia

Dopa Decarboxylase or Aromatic-L-amino-acid decarboxylase

Display Data Channel - communication between graphics card and monitor

Direct Displacement Control

Digital Down Converter - one of the methods in digital signal processing

Direct Digital Control - reading and steering of HVAC devices

The IATA airport code for Dodge City Regional Airport in Dodge City, Kansas