Long Lake Sagamore Seaplane Base (FAA LID: K03) is a privately owned, public use seaplane base on Long Lake in the Town of Long Lake, Hamilton County, New York, United States.

[1][2] Long Lake Sagamore Seaplane Base resides at elevation of 1,629 feet (497 m) above mean sea level.

It has one seaplane landing area designated ALL/WAY with a water surface measuring 15,000 by 2,000 feet (4,572 x 610 m).

[1] For the 12-month period ending September 15, 2011, the airport had 60 general aviation aircraft operations.

At that time there were one single-engine aircraft based at this airport.