The Lake Hopatcong Yacht Club is a private yacht club located in Mount Arlington, Morris County, New Jersey, United States, in the northwestern part of New Jersey, on the small peninsula of Bertrand Island along the state's largest lake, Lake Hopatcong.

The club is non-profit, and governed by a slate of volunteers, elected by its members.

The exterior is white; the "great hall" interior displays the Adirondack architecture with dark woodwork, decorated in a nautical motif with the photographs of all past commodores adorning the walls.

The club has a youth program, called "The Juniors", and holds a variety of social affairs for all ages.

The social schedule includes a variety of Saturday night functions throughout the Spring and Summer.