Geiger Engineering GmbH is a German aircraft engine manufacturer based in Seigendorf, Hirschaid, Oberfranken.

The company specializes in the design and manufacture of electric aircraft engines and related systems, including batteries, electric controllers and aircraft propellers.

[1] Geiger's electric aircraft engines run from 12 to 60 kW (16 to 80 hp).

The HDP 10 is typical, a brushless 58 volt design producing 12.5 kW (17 hp) at 1950 rpm, with an outrunner coil at 93% efficiency.

The company also produces inverters, aircraft motor instrumentation, system diagnostic, recording and monitoring equipment, electric paramotor system management controllers, battery accumulators as well as line and solar chargers.