Irwin Salmon Chanin (/tʃænˈɪn/ CHAN-in) (October 29, 1891 – February 24, 1988) was an American architect and real estate developer, best known for designing several Art Deco towers and Broadway theaters.

[1] At Cooper Union he was noted as a founder of Alpha Mu Sigma, a fraternity for Jewish men.

This was followed by the Biltmore (Samuel J. Friedman), Majestic, Mansfield (Brooks Atkinson, Lena Horne), Masque (Golden), and Royale (Bernard B.

[1] The Chanins also built two apartment buildings on Central Park West: a twin-towered housing cooperative skyscraper named The Majestic in 1930 and The Century in 1931.

Near the end of Chanin's life, several of his developments were protected as New York City designated landmarks, including the Century Apartments, the Beacon Theatre, and all six of his Broadway theaters.