Gastonia is the most populous city in and county seat of Gaston County, North Carolina, United States. It is the second-largest satellite city of the Charlotte area, behind Concord. The population was 80,411 in the 2020 census, up from 71,741 in 2010. Gastonia is the 13th-most populous city in North Carolina. It is part of the Charlotte-Concord-Gastonia, NC-SC Metropolitan Statistical Area, which is part of the Charlotte-Concord, NC-SC Combined Statistical Area.

The Loray Mill strike of 1929 in Gastonia, North Carolina, was a notable strike action in the labor history of the United States. Though largely unsuccessful in attaining its goals of better working conditions and wages, the strike was considered successful in a lasting way; it caused an immense controversy which gave the labor movement momentum in the South.