The Maybach Mb IVa was a water-cooled aircraft and airship straight-six engine developed in Germany during World War I by Maybach-Motorenbau GmbH, a subsidiary of Zeppelin. It was one of the world's first series-produced engines designed specifically for high-altitude use. It was quite different engine design than the previous Maybach Mb.IV, not just a simple modification.

Maybach is a German luxury car brand owned by and a part of Mercedes-Benz AG. The original company was founded in 1909 by Wilhelm Maybach and his son Karl Maybach, originally as a subsidiary of Luftschiffbau Zeppelin GmbH, and it was known as Luftfahrzeug-Motorenbau GmbH until 1999.