Meryl Streep as Florence Foster Jenkins

Hugh Grant as St. Clair Bayfield

Simon Helberg as Cosmé McMoon

Rebecca Ferguson as Kathleen Weatherley

Nina Arianda as Agnes Stark

Stanley Townsend as Phineas Stark

Allan Corduner as John Totten

Christian McKay as Earl Wilson

David Haig as Carlo Edwards

John Sessions as Dr. Hermann

Brid Brennan as Kitty

John Kavanagh as Arturo Toscanini

Pat Starr as Mrs. Vanderbilt

Maggie Steed as Mrs. James O'Flaherty

Thelma Barlow as Mrs. Oscar Garmunder

Liza Ross as Mrs. EE Patterson

Paola Dionisotti as Baroness Le Feyre

Rhoda Lewis as Mrs. Patsy Snow

Aida Garifullina as Lily Pons

David Mills as Augustus Corbin

David Menkin as Carlton Smith

Sid Phoenix as Corporal Jones

Tunji Kasim as Private Smith

Carl Davis as Orlando Adams

Lloyd Hutchinson as Microphone Engineer

Richard Kilgour as Elevator Operator

Jonathan Plowright as Ernest Ziegler

Josh O'Connor as Donaghy

Brian Fisher as Finkler

Stefan Bednarczyk as Stephen Foster

Nathan Osgood as Stagehand

Caolan Byrne as Stagehand 2

John Guerrasio as Newspaper Vendor

Ewan Stewart as Colonel

Greg Lockett as Chuck

Cameron Cuffe as Gino

Georgina Morton as Pearl

James Sobol Kelly as Edgar (Diner)

Dar Dash as Antonio

Grant Gillespie as Brooklyn Man

Nat Luurtsema as Tallulah Bankhead

Philip Rosch as Archie the Doorman

Elliot Levey as Edgar Booth Cunningham, Jr.

Danny Mahoney as Clifford B. Thornton III

Simon Markson as Piano Tuner

Mark Arnold as Cole Porter

Adele Smyth-Kennedy as Wag Woman

Jenny Hawkins as Florence's Dresser

Hallam Rice-Edwards as Corbin's Gang

Victory Maburutse as Corbin's Gang

Rosy Benjamin as Corbin's Gang

Oliver King as Corbin's Gang

James Wallace as Corbin's Gang

Charles Streeter as Corbin's Gang

Andrew Sloane as Corbin's Gang

Madeleine Knight as Corbin's Gang

Stephanie Lane as Corbin's Gang

Philip Gascoyne as New York Journalist (uncredited)