This is an index to the makers of internal combustion engines, both Otto-cycle and Diesel-cycle, used in vehicles, transport, and other moving applications on land.

For uses of internal combustion engines in aircraft also see Category: Aircraft Engines and for uses in marine craft see the Category: Marine Engines

This section currently comprises engines made all over the world, but may be rearranged according to country of manufacture.

Additions and changes are being made on a regular basis.

For Stationary internal combustion engines see the Category: Stationary Engines