Olivia Colman Queen Elizabeth II Actor Tobias Menzies Prince Phillip Actor Helena Bonham Carter Princess Margaret Actor Jason Watkins Harold Wilson Actor Ben Daniels Tony Armstrong-Jones Actor Josh O'Connor Prince Charles Actor Erin Doherty Princess Anne Actor Marion Bailey The Queen Mother Actor Charles Dance Lord Mountbatten Actor Peter Morgan Writer, Executive Producer Stephen Daldry Executive Producer Philip Martin Executive Producer Andy Harries Executive Producer Suzanne Mackie Executive Producer Tanya Seghatchian Executive Producer Robert Fox Executive Producer Matthew Byam-Shaw Executive Producer