111 West 57th Street, also known as Steinway Tower, is a supertall residential skyscraper in the Midtown Manhattan neighborhood of New York City. Developed by JDS Development Group and Property Markets Group, it is situated along Billionaires' Row on the north side of 57th Street near Sixth Avenue. The main portion of the building is an 84-story, 1,428-foot (435-meter) tower designed by SHoP Architects and completed in 2021. Preserved at the base is the 16-story Steinway Building, a former Steinway & Sons store designed by Warren and Wetmore and completed in 1925, which originally carried the address 111 West 57th Street.

Billionaires' Row is the name of a group of ultra-luxury residential skyscrapers, and the area surrounding them, near the southern end of Central Park in Manhattan, New York City. Several of these buildings are in the supertall category, taller than 1,000 feet (300 m), and are among the tallest buildings in the world. Since most of these pencil towers are on 57th Street, the term can refer to this street, too.