Brewerton is a census-designated place (CDP) in the town of Cicero in Onondaga County and the town of Hastings in Oswego County in the U.S. state of New York. It lies at the west end of Oneida Lake at its outlet into the Oneida River. The population was 3,455 at the 2000 census. 19th century maps indicate that this area was once known as Fort Brewerton, while Brewerton meant the Cicero portion.
The community is sited near the former Fort Brewerton, erected in 1759 to defend the passage from Albany to the port of Oswego. Settlers arrived in 1789 to engage in the fur trade. The Fort Brewerton Block House Museum contains local relics dating back to Paleo-Indian times. It is located next to the original fort.
In the late 18th century two Presbyterians, Rev. John Shepard and Deacon George Ramsey started preaching in the area near the Fort Brewerton embankment. Deacon Ramsey built a schoolhouse nearby which was used for both instruction and worship.