Upo Wetland is a complex of natural wetlands located in Changnyeong County, South Gyeongsang Province, South Korea, near the Nakdong River. It is located in portions of Yueo-myeon, Ibang-myeon and Daehap-myeon. It derives its name from the largest of the wetlands, Upo. Other wetlands in the complex include Mokpo, Sajipo and Jjokjibeol wetlands. The complex as a whole covers 2.13 km2, and is the largest inland wetland in South Korea today. It is one of eight Ramsar wetlands in the country and one of the official visiting sites for the 10th Meeting of the Conference of the Contracting Parties that was held in Changwon, Korea in October, 2008.

Changnyeong County is a county in South Gyeongsang Province, South Korea.