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Setauket is a hamlet and census-designated place in the Town of Brookhaven, Suffolk County, on the North Shore of Long Island.

Setauket was founded in 1655 when English settlers from New England purchased the land from the Setalcott Indians, making it the first settlement in what became the town of Brookhaven.

The name Setauket comes from the Setalcott, the Algonquian-speaking Native people who lived in the area before colonization.

Setauket was counted as its own CDP for the first time in the 2020 census, when the old Setauket-East Setauket CDP was split in two; it recorded a population of 3,986 in about 1,413 households.

During the Revolutionary War, the Battle of Setauket was fought on the village green in 1777, when Patriot troops under General Samuel Holden Parsons attacked Loyalists fortified in the Presbyterian church and took cover behind the boulder still known as Patriots' Rock.

From 1778 to 1781, Setauket was the home base of the Culper Spy Ring, the network led by Benjamin Tallmadge and Abraham Woodhull that smuggled intelligence about British troop movements to George Washington.

Setauket's Caroline Church, built in 1729, is the oldest surviving church building in Suffolk County, and musket balls fired during the 1777 battle were found embedded in its walls.

The c. 1665 Brewster House in Setauket is the oldest existing structure in the town of Brookhaven and served as a tavern during the British occupation.

The Frank Melville Memorial Park, established in 1937, preserves the land around the Setauket Mill Pond at the heart of the Old Setauket Historic District.

Setauket forms part of Long Island's 'Three Village' area with Stony Brook and Old Field, served by the Three Village Central School District, and it borders the campus of Stony Brook University.