KT Sullivan is an American singer and actress known for her performances in cabaret and musical theatre. Sullivan performs her cabaret act in venues such as the Firebird Cafe and the Oak Room at the Algonquin Hotel in New York City, the Plush Room and the Third West Coast Cabaret Convention in San Francisco, and Pizza on the Park in London. In the West End, Sullivan appeared in Vienna to Weimar in 2004 and has performed in revues celebrating the songs of Noël Coward and Irving Berlin.