| Peter Sellers | Chief Insp. Jacques Clouseau |
| Herbert Lom | Chief Insp. Charles Dreyfus |
| Burt Kwouk | Cato Fong |
| Dyan Cannon | Simone Legree |
| Robert Webber | Philippe Douvier |
| Tony Beckley | Guy Algo |
| Robert Loggia | Al Marchione |
| Paul Stewart | Julio Scallini |
| André Maranne | François |
| Graham Stark | Professor Auguste Balls |
| Alfie Bass | Fernet |
| Sue Lloyd | Claude Russo |
| Danny Schiller | Cunny |
| Douglas Wilmer | Police Commissioner |
| Ferdy Mayne | Dr. Paul Laprone |
| Charles Augins | Vic Vancouver |
| Irvin Allen | Haig & Haig guy #1 |
| Robert LaBassiere | Haig & Haig guy #2 |
| John Wyman | Toledo |
| Lon Satton | Sam Spade and the Private Eyes member #1 |
| Rosita Yarboy | Sam Spade and the Private Eyes member #2 |
| Keith Hodiak | Sam Spade and the Private Eyes member #3 |
| Pepsi Maycock | Sam Spade and the Private Eyes member #4 |
| Elisabeth Welch | Mrs. Wu |
| Valerie Leon | Tanya |
| Anthony Chinn | Chinese doorman |
| Kristopher Kum | Chinese businessman |
| Maureen Tann | Chinese lady of easy virtue #1 |
| Me Me Lai | Chinese lady of easy virtue #2 |
| Jacqui Simm | Chinese lady of easy virtue #3 |
| Fiesta Mei Ling | Chinese lady of easy virtue #4 |
| Adrienne Corri | Therese Douvier |
| Alec Bregonzi | Douvier's board member #1 |
| Arnold Diamond | Douvier's board member #2 |
| John G. Heller | Douvier's board member #3 |
| David King | Douvier's board member #4 |
| Steve Plytas | Douvier's board member #5 |
| Fredric Abbott | Douvier's soldier #1 |
| Norman Hartley | Douver's soldier #2 |
| Paul Antrim | Lookout |
| John Newbury | President |
| John Clive | President's aide |
| Brian Jackson | Police Chief |
| Margaret Anderson | Police Chief's wife |
| Andrew Lodge | Police sergeant |
| Henry McGee | Officer Bardot |
| Andrew Sachs | Hercule Poirot |
| Christine Shaw | Nurse |
| Julian Orchard | Hospital clerk |
| Michael Ward | Real estate agent |
| Maria Charles | Lady client |
| Frank Williams | Gentleman client |
| Rita Webb | Lady at window |
| John Bluthal | Guard at cemetery |
| John A. Tinn | Mr. Chow |
| Keen Jing | Assistant manager |
| Bernie R. Hickban | Desk clerk |
| Robert La Bassier | Haig & Haig |
| Marc Lawrence | Gangster |
| David Lodge | Extra |
| Ed Parker | Mr. Chong |
| Herb Tanney | Hong Kong Police Chief |
