The Jumo 210 was Junkers' first production inverted V12 gasoline aircraft engine, first produced in the early 1930s.

The 210 was odd in that the cylinders were machined into a block along with one side of the crankcase, two such parts being bolted together side-by-side to form the engine.

With the official formation of the RLM in 1933, numerical engine designations by manufacturer were rationalized with Junkers receiving the "200 block", the L10 becoming the 210.

Nevertheless, almost all German aircraft designs of the era were based on the 210, which is why they were so small compared to other countries' efforts.

In 1936 the new 670 PS (661 hp, 493 kW) 210D and 210E were introduced, which had the same gearing as the B and C but used a new two-speed supercharger to increase takeoff power and altitude performance.

The Jumo system used a small pump piston positioned beside each of the main cylinders, driven off the crank shaft.

The injector used a simple check valve to prevent internal pressure from blowing back into the fuel line, and the pump was timed to inject at the proper point in the intake cycle.