Trailer
 | Rupert Davies as Commissaire Jules Maigret |
 | Helen Shingler as Madame Maigret |
 | Neville Jason as Lapointe |
 | Gillian Hills as Nicole Prieur |
 | Yootha Joyce as Mlle. Motte |
 | Mary Webster as Aline Palmari |
| Clive Cazes as Manuel Palmari |
| Tony Harwood as Dr. Francois Melan |
| Geoffrey Morris as Dr. Pardon |
 | Martin Miller as Prof. Vivier |
| Luke Hanson as Acolant |
| Charles Leno as Director of P.J. |
 | Donald Pickering as Préfet de Police |
| Murray Evans as Oscar Coutant |
| Victor Langley as Philippe Landry |
 | Kenneth Benda as Jean-Baptiste Prieur |
| Stephen Zammit as Désiré |
| Ian Gray as Hotel Porter |
| Anne Tirard as Hotel Manageress |
| Leonardo Pieroni as Maigret's shadow |
| Stanley Davies as Sergeant Julien |
 | Walter Horsbrugh as Police surgeon |
| Marc Barrett as Inspector Barnacle |
| Robin Scott as Police Inspector |
 | Peter Sallis as (uncredited) |
| Directing | |
| William Slater | Director |
Writing | |
| Georges Simenon | Novel |
| Donald Bull | Writer |
Sound | |
| Ron Grainer | Music |
Production | |
| Cedric Messina | Producer |
Art | |
| Eileen Diss | Production Design |
Writing | |
| Rosemary Hill | Script Editor |
