| Unit Name: | Japanese Twenty-Seventh Army |
| Dates: | March 16, 1944 - February 1, 1945 |
| Country: | Empire of Japan |
| Branch: | Imperial Japanese Army |
| Type: | Infantry |
| Role: | Corps |
| Garrison: | Etorofu |
| Battles: | Soviet invasion of Manchuria |
The was an army of the Imperial Japanese Army during the final days of World War II.
The Japanese 27th Army was formed on March 16, 1944, as part of the last desperate defense effort by the Empire of Japan to deter possible landings of Allied forces in the northern Chishima Islands territories from northeastern Hokkaidō to Kamchatka during Operation Downfall. It was headquartered on Etorofu.
The Japanese 27th Army consisted mostly of poorly trained reservists, conscripted students and home guard militia. It was disbanded on February 1, 1945, and its units were incorporated directly into the Japanese 5th Area Army
| Name | From | To | |
| Commanding officer | 10 March 1944 | 1 February 1945 | |
| Chief of Staff | 10 March 1944 | 1 February 1945 | |