THE DIAMANT FAMILY
Alfred Diamant: Gary Oldman

Renee Diamant (nee Wigsley): Marcia Cross

Marius Diamant: William Zabka

Ralph Diamant: Chris Pratt

Maxine "Max" Diamant: Emma Stone

THE THROMBEY FAMILY
Harlan Thrombey: Christopher Plummer

Linda Drysdale: Jamie Lee Curtis

Richard Drysdale: Don Johnson

Hugh Ransom Drysdale: Chris Evans

Walt Thrombey: Michael Shannon

Donna Thrombey: Riki Lindhome

Jacob Thrombey: Jaeden Martell

Joni Thrombey: Toni Collette

Meg Thrombey: Katherine Langford

THE STAFF:
Fran: Edi Patterson

Marta Cabrera: Ana de Armas

Louise, the Diamant's maid: Emma Thompson

Johann, the Diamant butler and chauffeur : Christoph Waltz