Defence Evaluation and Research Agency (DERA) was a UK government agency focused on defence research and evaluation, operating as a trading fund and headquartered in Farnborough.
DEUTZ-MWM is a manufacturer of marine diesel engines, including propulsion units for fast ships with power ranges from 420 to 1,935 kW (570 to 2,630 hp). The company also supplies machinery parts for marine, electric power, petroleum, and industrial applications.
DFDS A/S is a Danish international shipping and logistics company specializing in maritime transport of goods and passengers, operating ferry routes across Europe.
DFDS Tor Line AB is a Swedish freight shipping company offering flexible freight shipping options and container routes across Europe, specializing in Ro-Ro and Ro-Pax services.
DHE Projects Ltd specializes in electrical engineering solutions including power generation, switchgear, and control systems for marine and offshore industries.