Brunswick ( BRUN-zwik) is a city in and the county seat of Glynn County in the U.S. state of Georgia. As the primary urban and economic center of the lower southeast portion of Georgia, it is the second-largest urban area on the Georgia coastline after Savannah and contains the Brunswick Old Town Historic District. At the 2020 U.S. census, the population of the city proper was 15,210; the Brunswick metropolitan area's population as of 2020 was 113,495.

Established as "Brunswick" after the German Duchy of Brunswick–Lüneburg, the ancestral home of the House of Hanover, the municipal community was incorporated as a city in 1856. Throughout its history, Brunswick has served as an important port city; in World War II, for example, it served as a strategic military location with an operational base for escort blimps and a shipbuilding facility for the U.S. Maritime Commission. Since then, its port has served numerous economic purposes.

Brunswick supports a progressive economy largely based on tourism and logistics, with a metropolitan GDP of $3.9 billion as of 2013. The Port of Brunswick, one of Georgia's two seaports, handles approximately 10 percent of all U.S. roll-on/roll-off trade—third in the U.S., behind the ports of Los Angeles and Newark. The headquarters of the Federal Law Enforcement Training Center is located 5 miles (8 km) north of the central business district of the city and is adjacent to Brunswick Golden Isles Airport, which provides commercial air service to the area.

Brunswick is located on a harbor of the Atlantic Ocean, approximately 40 mi (60 km) north of Florida and 80 mi (130 km) south of South Carolina. Brunswick is bordered on the west by Oglethorpe Bay, the East River, and the Turtle River. It is bordered on the south by the Brunswick River and on the east by the Atlantic Intracoastal Waterway in the Mackay River, which separates it from the Golden Isles.