- Writer:
- Berthold Brecht
- English version by:
- Charles Laughton
- Edited for radio by:
- H.B. Fortuin
- Edited for radio by:
- W.A. Glen-Doepel
- Producer:
- H.B. Fortuin
- Composer:
- Hanns Eisler
- Galileo Galilei:
- Edward Chapman
- Andrea Sarti, as a boy:
- Jonathan Margetts
- Andrea Sarti, as a man:
- William Eedle
- Mrs Sarti, Galileo's housekeeper:
- Kathleen Helme
- Ludovico Marsili, a wealthy young man:
- Gabriel Woolf
- Prioli, Procurator, University of Padua:
- Norman Claridge
- Sagredo, Galileo's friend:
- George Hagan
- Virginia, Galileo's daughter:
- Pauline Jameson
- The Philosopher:
- Godfrey Kenton
- The Mathematician:
- Rolf Lefebvre
- Court Lady:
- Sylvia Coleridge
- Court Lady:
- Jane Jordan Rogers
- Federzoni:
- Duncan McIntyre
- Fat Prelate:
- George Merritt
- Infuriated Monk:
- Jon Rollason
- Old Cardinal:
- Edgar Norfolk
- The Little Monk:
- Michael Bryant
- Cardinal Bellarmine:
- Richard Williams
- Cardinal Barberini, later Pope Urban VIII:
- Heron Carvic
- Cardinal Inquisitor:
- James Thomason
- Gaffone, Rector of the University of Pisa:
- Rolf Lefebvre
- Ballad Singer:
- Edmund Donlevy
- Vanni, an iron founder:
- Philip Cunningham
- Grand Duke Cosimo de Medici:
- John Rye
- Informer of the Inquisition:
- Leigh Crutchley
- Titles Spoken By:
- Janet Burnell
- Commentator:
- Michael Turner
- Music Director:
- Walter Goehr
- Singers:
- Schola Polyphonica
- Director (Schola Polyphnica):
- Henry Washington
- Flautist:
- Geoffrey Gilbert
- Clarinettist:
- Gervase de Peyer
- Harpsichordist:
- Charles Spinks
- Musicians (Interval):
- Eastman-Rochester Symphony Orchestra
- Conductor (Interval):
- Howard Hanson
