The South River Club is a social club located just south of Annapolis in Anne Arundel County, Maryland. The name also refers to the group's clubhouse, which was built in 1742.

The South River Club (also known as "The Old South River Club") is one of the country's oldest, continuously active organizations of its type. Early records were lost when the first clubhouse burned down, but there is evidence that the club existed in 1732 and perhaps as early as 1700. Club records show that it existed before February 11, 1742, when a resolution was passed to attempt to record all previous members' names. As early as 1746, the club was referred to as "The Ancient South River Club" in the Maryland Gazette.

Early members included prominent landowners, merchants, and the local doctor and clergyman, all of whom lived within a 10-mile radius of the clubhouse.

The members of the club meet at the clubhouse four times per year for feasts prepared in the detached kitchen. Women are only allowed in the clubhouse on "Pilgrimage Days."

It is not clear where the first clubhouse stood. There is speculation that it was in Londontowne, Maryland.

The present structure was built in 1742 on land purchased from Captain Thomas Gassaway, son of Colonel Nicholas Gassaway. It is a small frame, 1+1⁄2-story one-room clubhouse with a gable roof and a narrow exterior chimney on the east gable end. It was listed on the National Register of Historic Places in 1969.

• Joseph Noble Stockett

• List of traditional gentlemen's clubs in the United States

• South River Club, Anne Arundel County, including photo from 1967, at Maryland Historical Trust
• Historic American Buildings Survey (HABS) No. MD-843, "South River Club, Solomons Island Road (State Route 2) vicinity, South River vicinity, Anne Arundel County, MD"
• Pitts, Jonathan (September 22, 2012). "Old South River Club has met for more than 320 years". The Baltimore Sun.