Phoenix Laroche as William

Alex Lawther as Velveteen Rabbit (voice)

Samantha Colley as Mother

Leonard Buckley as Father

Tilly Vosburgh as Mary "Momo"

Helena Bonham Carter as Wise Horse (voice)

Lois Chimimba as Car (voice)

Paterson Joseph as King (voice)

Clive Rowe as Lion (voice)

Ellie Mejia as Miss Forrester

Conor Hamill as William's Friend

Paul Sparkes as Removal Man

Kiefer Moriarty as Adult at Party

Elizabeth O'Toole as Lucy

Jack Finn as Child

Declan Mills as George

Edward Baker-Duly as Doctor

Sean Duggan as Teacher

Nathaniel Parker as Male Rabbit (voice)

Bethany Antonia as Female Rabbit (voice)

Nicola Coughlan as Playroom Fairy (voice)

Ian Dillon as Church Attendee (uncredited)