Cy Walter (September 16, 1915 – August 18, 1968) was an American café society pianist based in New York City for four decades. Dubbed the "Art Tatum of Park Avenue," he was praised for his extensive repertoire (with an emphasis on show tunes) and improvisatory skill. His long radio and recording career included both solo and duo performances, and stints as accompanist for such elegant vocal stylists as Greta Keller, Mabel Mercer, and Lee Wiley.