550 Madison Avenue is a postmodern skyscraper on Madison Avenue between 55th and 56th Streets in the Midtown Manhattan neighborhood of New York City, New York, U.S. Designed by Philip Johnson and John Burgee with associate architect Simmons Architects, the building is a 647-foot-tall (197-meter), 37-story office tower with a facade made of pink granite. It was completed in 1984 as the headquarters of AT&T Corp. and later became the American headquarters of Sony. A four-story granite annex to the west was demolished and replaced with a shorter annex in the early 2020s.

John Burgee is an American architect noted for his contributions to Postmodern architecture. He was a partner of Philip Johnson from 1967 to 1991, creating together the partnership firm Johnson/Burgee Architects. Their landmark collaborations included Pennzoil Place in Houston and the AT&T World Headquarters in New York. Burgee eased Johnson out of the firm in 1991, and when it subsequently went bankrupt, Burgee's design career was essentially over. Burgee is retired, and resides in California.