The Zhejiang-Jiangxi campaign or the Chekiang–Kiangsi campaign, also known as Operation Sei-go, was a campaign by the China Expeditionary Army of the Imperial Japanese Army under Shunroku Hata and Chinese 3rd War Area forces under Gu Zhutong in Chinese provinces of Zhejiang and Jiangxi from mid May to early September 1942.

Shunroku Hata was a field marshal (gensui) in the Imperial Japanese Army during World War II. He was the last surviving Japanese military officer with a marshal's rank. Hata was convicted of war crimes and sentenced to life imprisonment in 1948, but was paroled in 1955.