The Green Bay metropolitan statistical area, as defined by the United States Census Bureau, is a metropolitan area in northeastern Wisconsin anchored by the City of Green Bay. It is Wisconsin's fourth largest metropolitan statistical area by population. As of the 2020 Census, the MSA had a combined population of 328,268.

Green Bay is a city in the U.S. state of Wisconsin. The county seat of Brown County, it is at the head of Green Bay, a sub-basin of Lake Michigan at the mouth of the Fox River. As of the 2020 Census, Green Bay had a population of 107,395, making it the third-most populous city in Wisconsin, after Milwaukee and Madison, and the third-largest city on Lake Michigan, after Chicago and Milwaukee.