Renée Zellweger (Judy Garland), Jessie Buckley (Rosalyn Wilder), Finn Wittrock (Mickey Deans), Rufus Sewell (Sid Luft), Michael Gambon (Bernard Delfont), Richard Cordery (Louis B. Mayer), Royce Pierreson (Burt Rhodes), Darci Shaw (Young Judy), Andy Nyman (Dan), Daniel Cerqueira (Stan), Bella Ramsey (Lorna Luft), Lewin Lloyd (Joey Luft), Tom Durant Pritchard (Ken Frisch), Gaia Weiss (Abbie), Gemma-Leah Devereux (Liza Minnelli), John Dagleish (Lonnie Donegan), Adrian Lukis (Dr Hargreaves), Gus Barry (Mickey Rooney), Jodie McNee (Vivian)