The Sagamore Yacht Club was founded in 1944. Back in the 1930's and 1940's the Roosevelt Memorial Park (and marina), owned and maintained by the Roosevelt Memorial Association, was turned over to the town of Oyster Bay. At the time it was occupied by few large boats. The "Maid", which was owned by the Club's first Commodore (C. Russell Haff), the tender for George Roosevelt's schooner the "Mistress", another boat owned by Harry Von Zell (a famous TV personality), and a 52 foot schooner owned by Robert Todd of Syosset. All of these boats were commissioned by the Government during World War II.

It was just about at this time that a few boatmen got together at the dockmaster's shack (captain Young a retired tug boat captain). The "Clubhouse", located at about the site of the now defunct Jakobson's Shipyard, was housed in a beached concrete hulled ex-Navy submarine tender (it was eventually refloated and towed to Freeport where it became the Freeport Yacht Club. At this gathering invitations were mailed to about 25 friends and acquaintances. They were asked to attend a meeting for the purpose of starting or acquiring a yacht club. Much to everyone's surprise twenty people showed up, many of whom are listed as the Club's charter members.

It was decided at this gathering to contact the Town Councilman, Elmer Brooks to ask if it were possible to have the marina and a small building for the "Club". It was agreed that the Club would operate the marina and that an attendant would provide service for gas, oil, ice, snacks and landing privileges to the general yachting public. The Town Board agreed to lease the property to the club for the amount of $500.00 per year. the Club's name, Sagamore, was chosen in honor of Teddy Roosevelt, whose summer white house is located in Sagamore Hill in Oyster Bay. The club's burgee, designed by Schell Lewis, was adopted.

During the post-war year, the club grew rapidly and with it the demand for additional dock space. It was about at this time that the Town Board seriously considered building a much larger marina.
Many vessels have used the club's facilities over the years. By far the most famous to land at our facilities for both supplies and passengers was the largest individually owned yacht in the world, "Sea Cloud". Sea Cloud, owned by Joseph E. Davies (the ambassador to the Soviet Union during World War II), was a 300 plus feet bark having masts so tall that it could not clear the bridges in the East River in New York.

In early 2007 it was decided that a house restoration plan be put into effect. This plan included means to refit the aging upstairs board room and office into a bar and full gathering place, equipped with central air and a spacious warm fireplace. The 2007 restoration also expanded and renovated the downstairs bar and dining room, not to mention a new fully equipped kitchen. All of the hard wok is finished and members today enjoy a brand new life of Sagamore.