The Upper West Side, sometimes abbreviated UWS, is a neighborhood in the borough of Manhattan, New York City. The Upper West Side is bounded on the south by 59th Street, Central Park to the east, the Hudson River to the west, and 110th Street to the north. The area north of West 96th Street and east of Broadway is also identified as Manhattan Valley.

From west to east, the avenues of the Upper West Side are Riverside Drive, West End Avenue (11th Avenue), Broadway, Amsterdam Avenue (10th Avenue), Columbus Avenue (9th Avenue), and Central Park West (8th Avenue). The 66-block stretch of Broadway forms the spine of the neighborhood and runs diagonally north/south across the other avenues at the south end of the neighborhood; above 78th Street Broadway runs north parallel to the other avenues. Broadway enters the neighborhood at its juncture with Central Park West at Columbus Circle (59th Street), crosses Columbus Avenue at Lincoln Square (65th Street), Amsterdam Avenue at Verdi Square (71st Street), and then merges with West End Avenue at Straus Park (aka Bloomingdale Square, at 107th Street).

The Upper West Side is part of Manhattan Community District 7 and its primary ZIP Codes are 10023, 10024, 10025, and 10069. It is patrolled by the 20th and 24th Precincts of the New York City Police Department.