Selden is a hamlet and census-designated place in the Town of Brookhaven in Suffolk County, New York, United States. The population was 21,262 at the time of the 2020 census.
The Selden Campus of Suffolk County Community College, located within the hamlet
From The Diary of Captain Daniel Roe, 1806–08 (1904), caption reads: "School house near home of Capt. Daniel Roe. Near the tree, at the right, tradition says the Tory Captain Richard Miller fell from his horse in 1776."