Belle Chasse is a census-designated place (CDP) in Plaquemines Parish, Louisiana, United States, on the west bank of the Mississippi River. Belle Chasse is part of the Greater New Orleans metropolitan area. The population was 10,579 at the 2020 United States census. Belle Chasse is the largest community in Plaquemines Parish. It is home to Naval Air Station Joint Reserve Base New Orleans, a Naval Air Station for the U.S. Navy Reserve.

Plaquemines Parish is a parish located in the U.S. state of Louisiana. With a population of 23,515 at the 2020 census, the parish seat is Pointe à la Hache and the largest community is Belle Chasse. The parish was formed in 1807.