Burlington County is a county in the U.S. state of New Jersey. The county is the largest in New Jersey by area. Its county seat is Mount Holly. As of the 2020 United States Census, Burlington County's population was 461,860, making it the 11th-largest of the state's 21 counties, representing a 13,126 (2.9%) increase from the 448,734 residents enumerated in 2010 U.S. Census, which in turn was an increase of 25,340 (6.0%) from the 423,394 enumerated in the 2000 Census. The most populous place in the county was Evesham Township, with 45,538 residents at the time of the 2010 Census, while Washington Township covered 102.71 square miles (266.0 km2), the largest area of any municipality in Burlington County.

Burlington County is located east of the Delaware River and is part of the Philadelphia-Camden-Vineland, PA-NJ-DE-MD Combined Statistical Area, also known as the Delaware Valley. However, the county stretches across the state, and its southeast corner reaches tidal estuaries leading to southern New Jersey's Great Bay, which separates the county from the Atlantic Ocean.