The Nakajima Ki-49 Donryu (呑龍, "Storm Dragon")[1] was a twin-engine Japanese World War II heavy bomber.

[2] Learning from service trials of the Ki-21, the Army realized that however advanced it may have been at the time of its introduction, its new Mitsubishi bomber would in due course be unable to operate without fighter escorts.

Combat experience in China and New Guinea showed the Donryu to be underpowered, with bomb capacity and speed suffering as a result.

Thus, in the spring of 1942 an up-engined version was produced, fitted with more powerful Ha-109 engines and this became the production Army Type 100 Heavy Bomber Model 2 or Ki-49-IIa.

In early 1943, further power increases were delayed, owing to development difficulties with the 1,805 kW (2,421 hp) Nakajima Ha-117 engines, and the Ki-49-III never entered production, with only six prototypes being built.