- Author:
- Bertolt Brecht
- English version:
- Charles Laughton
- Edited for radio by/Producer:
- H.B. Fortuin
- Edited for radio by:
- W.A. Glen-Doepel
- Music:
- Hanns Eisler
- Music sung by:
- A section of the Choir of Brompton Oratory
- Conductor:
- Walter Goehr
- In Padua - Galileo Galilei:
- Edward Chapman
- In Padua - Andrea Sarti, as a boy:
- Jonathan Margetts
- In Padua - Andrea Sarti, as a man:
- William Eedle
- In Padua - Mrs Sarti, Galileo's housekeeper:
- Kathleen Helme
- In Padua - Ludovico Marsili, a wealthy young man:
- Gabriel Woolf
- In Padua - Prioli, Procurator of the University of Padua:
- Norman Claridge
- In Padua - Sagredo, Galileo's friend:
- George Hagan
- In Padua - Virginia, Galileo's daughter:
- Pauline Jameson
- In Florence - The Lord Chamberlain:
- Richard Williams
- In Florence - The Philosopher:
- Godfrey Kenton
- In Florence - The Mathematician:
- Rolf Lefebvre
- In Florence - Court Lady:
- Sylvia Coleridge
- In Florence - Court Lady:
- Jane Jordan Rogers
- In Florence - Federzoni:
- Duncan McIntyre
- In Rome - Fat Prelate:
- George Merritt
- In Rome - Infuriated Monk:
- Jon Rollason
- In Rome - Old Cardinal:
- Edgar Norfolk
- In Rome - Young Attendant Monk:
- John Rye
- In Rome - The Little Monk:
- Michael Bryant
- In Rome - Cardinal Bellarmine:
- Richard Williams
- In Rome - Cardinal Barberini, later Pope Urban VIII:
- Heron Carvic
- In Rome - Cardinal Inquisitor:
- James Thomason
- In Rome - Phillippo Mucius, a scientist:
- Leigh Crutchley
- In Rome - Gaffone, Rector of the University of Pisa:
- Rolf Lefebvre
- In Rome - A Ballad Singer:
- Edmund Donlevy
- In Rome - Vanni, an iron founder:
- Philip Cunningham
- In Rome - Grand Duke Cosimo de Medici:
- John Rye
- In Rome - An Informer of the Inquisition:
- Leigh Crutchley
- Titles spoken by:
- Janet Burnell
- Commentator:
- Michael Turner
- Other parts played by:
- Members of the BBC Drama Repertory Company
