Truly a club for all seasons, MSYC is located on beautiful Mt. Sinai Harbor just east of Port Jefferson Harbor. The clubhouse is available to members for private parties. Long Island Sound swimming is available at Cedar Beach directly across the street, a short walk from the club.  

Incorporated in 1964, the founders of Mt. Sinai Yacht Club envisioned a place where working people would share a common love of recreational boating in a family oriented place that fostered an atmosphere of hospitality and a safe haven to boaters of the Long Island Sound. Initial meetings were held at the Old Fire House in Mt. Sinai. The club organizers negotiated a lease with the Tuthill family for a strip of land 150 feet wide , running north to south along Mt. Sinai Harbor. Today, the property is leased from the Town of Brookhaven.

In August of 1966, the search for a clubhouse led to a barge in the Delhart Shipyard on Staten Island. Originally belonging to the Baltimore and Ohio railroad, the retired reefer barge had been built to carry fruits and vegetables under iced conditions. Negotiations on behalf of the club were entered into by the McCormach Sand and Gravel Company, and brought the asking price from $1,500.00 down to $800.00. The price included a 36' x 10' float and towing to Mt. Sinai Harbor. Once delivered, engineers, carpenters and other club members spent many hours turning the barge into an attractive clubhouse.

The float became the club's first docking facility which was quickly outgrown as membership rose. Six slips in 1966 gave way to a 36 slip marina which was in turn replaced by an attractive, modern 99 slip floating-dock marina providing water, electric power, telephone lines and a gas and diesel fuel dock.

Composed of family and individual memberships, boaters and non-boaters, members and their guests are welcome to enjoy the wide range of year round activities offered by MSYC. The members of MSYC use good spirit and old-fashioned hard work to make the original vision a reality. Construction of a new clubhouse was completed in October of 2003 and is now being fully utilized and enjoyed by our members.