Florence Foster Jenkins
St. Clair Bayfield
Cosmé McMoon
Kathleen Weatherley
Agnes Stark
Phineas Stark
John Totten
Earl Wilson
Carlo Edwards
Dr. Hermann
Kitty
Arturo Toscanini
Mrs. Vanderbilt
Mrs. James O'Flaherty
Mrs. Oscar Garmunder
Mrs. EE Patterson
Baroness Le Feyre
Mrs. Patsy Snow
Lily Pons
Augustus Corbin
Carlton Smith
Corporal Jones
Private Smith
Orlando Adams
Microphone Engineer
Elevator Operator
Ernest Ziegler
Donaghy
Finkler
Stephen Foster
Stagehand
Stagehand 2
Newspaper Vendor
Colonel
Chuck
Gino
Pearl
Edgar (Diner)
Antonio
Brooklyn Man
Tallulah Bankhead
Archie the Doorman
Edgar Booth Cunningham, Jr.
Clifford B. Thornton III
Piano Tuner
Cole Porter
Wag Woman
Florence's Dresser
Corbin's Gang
New York Journalist (uncredited)