The West Side Line is a railroad line in Manhattan, New York City.
West Side Line may also refer to:
West Side Line (California), a Southern Pacific railroad line built in the 1890s, now the San Joaquin Valley Railroad West Side line (Oregon), built in the 1860s, later also owned by the Southern Pacific The IRT West Side Line, a New York City Subway line West Side Line, a streetcar line in Cleveland, Ohio, US