Berwick is a town in St. Mary Parish, Louisiana, United States. The population was 4,418 at the 2000 census. It is part of the Morgan City Micropolitan Statistical Area.
V.J. Bella, state representative from St. Mary Parish from 1972–1980, was known as a legislative fiscal watchdog. Prior to his legislative service, Bella was the fire chief in Berwick. He subsequently served as state fire marshal.
The first white settler to trek through the wilderness in this area was Thomas Berwick, a surveyor from Pennsylvania who was working in Opelousas, Louisiana. He settled along the banks of the Atchafalaya River in the late 18th century. Today the town of Berwick is home to several seafood processing plants and numerous boat companies.