| Unit Name: | Japanese Thirteenth Army |
| Native Name: | Japanese: 第13軍 |Dai-jyūsan gun |
| Dates: | September 23, 1939 - August 15, 1945 |
| Country: | Empire of Japan |
| Branch: | Imperial Japanese Army |
| Type: | Infantry |
| Role: | Corps |
| Garrison: | Shanghai |
| Notable Commanders: | Sadamu Shimomura |
The was an army of the Imperial Japanese Army during the Second Sino-Japanese War and World War II.
The Japanese 13th Army was formed on September 23, 1939, under the control of the China Expeditionary Army. It was based in Shanghai and surrounding provinces primarily a garrison force to maintain public order and to engage in counter-insurgency operations in conjunction with the collaborationist forces of the Reformed Government of the Republic of China, and later with its successor, the Wang Jingwei Government. It was later tasked with deterring possible landings of the Allies in the lower Yangtze River area of east central China. It surrendered to the Chinese Kuomintang forces on August 15, 1945, at the surrender of Japan and was disbanded in Shanghai.
| Name | From | To | |
| 1 | 12 September 1939 | 26 October 1939 | |
| 2 | 26 October 1939 | 2 December 1940 | |
| 3 | 2 December 1940 | October 8, 1942 | |
| 4 | 8 October 1942 | March 22, 1944 | |
| 5 | 22 March 1944 | February 1, 1945 | |
| 6 | 1 February 1945 | 15 August 1945 | |
| Name | From | To | |
| 1 | 4 September 1939 | 20 January 1941 | |
| 2 | 20 January 1941 | 19 September 1941 | |
| 3 | 19 September 1941 | 1 December 1942 | |
| 4 | 1 December 1942 | 17 January 1944 | |
| 5 | 17 January 1944 | 22 November 1945 | |
| 6 | 22 November 1944 | 1 February 1945 | |
| 7 | 1 February 1944 | 1 September 1945 | |