- Cummins
 - Designs, manufactures, distributes, and services engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems.  Deutz UK Ltd.
- Manufacturers of engines, parts, combined heat and power, power generations; offers also repair services.- EnPro Industries
- Product line includes gaskets and sealing systems, air compressors, truck and trailer wheel-end systems, large and medium-speed diesel engines, and tools and dies for the automotive and fastener industries.
- Fairbanks Morse Engine
- Manufactures efficient power solutions utilizing diesel engines, dual fuel engines, and gas turbines for distributed energy, municipal utilities, cogeneration, and government marine applications.
- Industrial Commutator Company (ICC)
- Commutator and slip ring manufacturer for railways, airlines, and other industries.
- Interstate-McBee
- A worldwide manufacturer of diesel engines and fuel-injection components.
- Jinjiang Junri Machinery
- Specialises in producing nozzles, plungers, auto parts, and fuel injection systems.
- John Deere: Engine Manufacturing
- Maker of diesel, marine, and small engines.
- Kohler Engines
- Includes a guide to engines, parts, and more.
- Kubota Engine America
- Manufacturer of compact diesel and gasoline engines for industrial, agricultural, construction, and generator applications.
- MTU Friedrichshafen@
- Navistar International@
- P. M. Diesels Ltd.
- Exports diesel engines, mud pumps, generators, and agricultural machinery.
- Perkins Engines Company Limited
- Manufacturers of diesel and natural gas engines and parts for industrial, construction, agricultural, power generation, and marine applications.
- Robin Subaru
- Makers of generators, pumps, and engines.
- Rockford Powertrain
- Manufacturer of heavy-duty off-highway, agricultural and industrial engine component parts.
- San Chih Electric & Machinery Corp.
- Products include DC variable speed motors and AC torque motors.
- Scania
- Manufacturer of trucks, buses, and industrial and marine engines.
- Wärtsilä Diesel
- Manufacturer of medium-speed diesel engines and gas engines and supplier of high-speed marine diesel engines.
- Waukesha Engine Division Dresser Industries
- Global manufacturer of gaseous fueled internal combustion engines for natural gas compression, prime and standby power generation, pump, chiller and other industrial applications.
- Yanmar
- Makers of diesel powered engines.
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