Molly Belle Wright
Flavia de Luce
Martin Freeman
Colonel Havilland de Luce
Toby Jones
Inspector Hewitt
Jonathan Pryce
Dr. Kissing
Annette Badland
Mrs. Mullet
Karan Gill
Dogger
Hannah New
Harriet De Luce
Jamie Beamish
Horace Bonepenny
Nicholas Burns
Rôle non communiqué
Max Cortezi
Private Jones
Zach Colton
Young Havilland
James 'JD Knight' Dunn
Thug 2 (as James Dunn)
Marama Corlett
Zemirah
Blake Rowden
Baby Flavia
Casey Rowden
Baby Flavia
Evelyn Teixeira
Young Ophelia
Mya Florence Rose Angus
Young Daphne
Chipo Chung
Aunt Felicity
Ariella Glaser
Ophelia de Luce
Tallulah Conabeare
Daphne de Luce
Dominic Coleman
Sgt. Woolmer
Orlando Norman
Sgt. Graves
Michael Culkin
Dr. Darby
Elliot Collins
Tom
Lucy Briers
Miss Mountjoy
Justin Edwards
Mr. Tully
Nicholas Burns
Frank Pemberton
Mensah Bediako
Vicar
Antony Bunsee
Max
Fode Simbo
Desk Sergeant
Lawrence Russell
Mr. Teesdale
Liam Carrington
Young Bonepenny
Arthur Heath
Young Pemberton
Nadia Albina
Mrs. Ruggles
Kenna Bethany
Nurse
Ben Miles
King George