An engine developed based on the 6-cylinder Junkers L5 engine. The design of the L55 utilized two cylinder blocks from the L5 engine. It was used to power the Junkers A.32 and Junkers G.38 aircraft.
| Configuration | 12-cylinder V |
| Cooling | water |
| Displacement | 45.48 l |
| Weight | 585 kg |
| Maximum power | 690 hp |
| Rated power | 665 hp at 1700 rpm |
