The Lake Hopatcong Yacht Club is a private club located in Mount Arlington, Morris County, New Jersey, United States, in the northwestern part of New Jersey, on the state's largest lake, Lake Hopatcong. The club was founded in 1905, and the current clubhouse dates to 1910. In 2004, as part of the Club's centennial celebrations, N.J. Landing wrote A century of summers: the Lake Hopatcong Yacht Club's first hundred years which was a joint project of the Lake Hopatcong Historical Museum & Lake Hopatcong Yacht Club.