Mabel Mercer (3 February 1900 – 20 April 1984) was an English-born cabaret singer who performed in the United States, Britain, and Europe with the greats in jazz and cabaret. She was a featured performer at Chez Bricktop in Paris, owned by the hostess Bricktop, and performed in such clubs as Le Ruban Bleu, Tony's, the RSVP, the Carlyle, the St. Regis Hotel, and eventually her own room, the Byline Club. Among those who frequently attended Mercer's shows was Frank Sinatra, who made no secret of his emulating her phrasing and story-telling techniques.