Bay Ridge is a residential neighborhood in the southwest corner of the New York City borough of Brooklyn. It is bounded by Sunset Park on the north, Dyker Heights on the east, the Narrows and the Belt Parkway on the west, and Fort Hamilton Army Base and the Verrazzano-Narrows Bridge on the south. The section of Bay Ridge south of 86th Street is sometimes considered part of a sub-neighborhood called Fort Hamilton.

Bay Ridge was formerly the westernmost portion of the town of New Utrecht, comprising two smaller villages: Yellow Hook to the north and Fort Hamilton to the south. Yellow Hook was renamed Bay Ridge in 1853 to avoid negative connotations with yellow fever at the time.

Bay Ridge is part of Brooklyn Community District 10, and its primary ZIP Codes are 11209 and 11220. It is patrolled by the 68th Precinct of the New York City Police Department. Politically it is represented by the New York City Council's 43rd District.