The Wonder

Florence Pugh

(Lib Wright)

Kíla Lord Cassidy

(Anna O'Donnell)

Tom Burke

(Will Byrne)

Niamh Algar

(Kitty O’Donnell)

Elaine Cassidy

(Rosaleen O'Donnell)

Ruth Bradley

(Maggie Ryan)

Toby Jones

(Dr. McBrearty)

Ciarán Hinds

(Father Thaddeus)

Dermot Crowley

(Sir Otway)

Caolan Byrne

(Malachy O'Donnell)

Brían F. O'Byrne

(John Flynn)

Josie Walker

(Sister Michael)

David Wilmot

(Sean Ryan)

Stephen Ball

(Young Gentleman)

Mary Murray

(Woman)

Niamh Finlay

(Young Woman)

John Burke

(Man)

Emer Casey

(Woman in her 50's)

Graeme Coughlan

(Daguerreotypist)

Abigail Coburn

(Ryan Girl)

Janet Grene

(Working Class Lady)

Janet Grene

(Working Class Woman (uncredited))