DCD may refer to:
DCD (formerly DCD-Dorbyl) is a South African manufacturer and supplier of engineering solutions to the rail, mining & energy, defence and marine sectors.
DCD was originally established in 1946 as DCD Dorbyl (Pty) Limited, a merger of Dorman Long and Vanderbijl Engineering Corporation. It rebranded in 2012 as "DCD". (DCD is not connected with the JSE-listed Dorbyl Limited.)
The company specializes in engineering projects, including rail and military defence vehicle engineering, roller manufacturing, marine engineering and mine engineering. The current managing director is Mr Robert King following up from Mr Louis C J Taljaard.
In February 2010, Westinghouse and DCD- Dorbyl announced cooperation on creating a plant for building modules for AP1000 reactors.