Meryl Streep

Florence Foster Jenkins

Hugh Grant

St. Clair Bayfield

Simon Helberg

Cosmé McMoon

Rebecca Ferguson

Kathleen Weatherley

Nina Arianda

Agnes Stark

Stanley Townsend

Phineas Stark

Allan Corduner

John Totten

Christian McKay

Earl Wilson

David Haig

Carlo Edwards

John Sessions

Dr. Hermann

Brid Brennan

Kitty

John Kavanagh

Arturo Toscanini

Pat Starr

Mrs. Vanderbilt

Maggie Steed

Mrs. James O'Flaherty

Thelma Barlow

Mrs. Oscar Garmunder

Paola Dionisotti

Baroness Le Feyre

Rhoda Lewis

Mrs. Patsy Snow

Aida Garifullina

Lily Pons

David Menkin

Carlton Smith

Sid Phoenix

Corporal Jones

Tunji Kasim

Private Smith

Carl Davis

Orlando Adams

Lloyd Hutchinson

Microphone Engineer

Josh O'Connor

Donaghy

Nathan Osgood

Stagehand

Caolan Byrne

Stagehand 2

John Guerrasio

Newspaper Vendor

Ewan Stewart

Colonel

Cameron Cuffe

Gino

James Sobol Kelly

Edgar (Diner)

Grant Gillespie

Brooklyn Man

Philip Rosch

Archie the Doorman

Elliot Levey

Edgar Booth Cunningham, Jr.

Danny Mahoney

Clifford B. Thornton III

Mark Arnold

Cole Porter

Jenny Hawkins

Florence's Dresser

Madeleine Knight

Corbin's Gang

Stephanie Lane

Corbin's Gang

Philip Gascoyne

New York Journalist (uncredited)