The Bramo 323 Fafnir is a nine-cylinder radial aircraft engine of the World War II era.

Based heavily on Siemens/Bramo's earlier experience producing the Bristol Jupiter under licence,[1] the Bramo 323 saw limited use.

In the mid-1930s the Reich Air Ministry (RLM) altered the way in which engines were assigned code names, and Bramo was given the 300-block of numbers.

The reduced power at sea level was inevitable for engines with single-speed, mechanically-driven superchargers when they were regulated to a constant maximum boost pressure below their critical altitude.

BMW bought Bramo in 1939 and continued production to supply the small number of designs that already used it, notably the Do 17.