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Warren Beatty as Harley Rummel |
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Leslie Caron as Michele O'Brien |
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Robert Cummings as Dr. Philip Brock |
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Keenan Wynn as Angelo Carelli |
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Lionel Stander as Sam |
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Asa Maynor as Rusty |
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Cathleen Nesbitt as Mrs. Brock |
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Michael Bradley as John Thomas |
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Warren Mitchell as Frank Focus / Panel Moderator |
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Sydney Tafler as Panel Participant |
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Michael Kane as Staff Doctor |
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Riggs O'Hara as Glue Sniffer |
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Mavis Villiers as Rusty's Mother |
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Margaret Nolan as Mail-Order Film Girl |
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Viviane Ventura as Mail-Order Film Girl |
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George Moon as Neighbour |
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Charlotte Holland as Neighbour |
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Ferdy Mayne as Vittorio Fettucini |
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Libby Morris as Clinic Mother |
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Bessie Love as Pet Shop Customer |
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Jill Adams as Mrs. B.M. von Crispin |
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Donald Sutherland as Autograph Seeking Father (uncredited) |
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Jo Anne Worley as Autograph Seeking Mother (uncredited) |
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Anita Sharp-Bolster as Mrs. Egan (uncredited) |
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Chuck Julian as Grocery Clerk (uncredited) |
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Vera Goulet as Nurse (uncredited) |
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Michael Chaplin as Heathcliff – Beatnik (uncredited) |
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Pauline Chamberlain as Woman in Audience (uncredited) |
| Production | John Wakefield | Unit Manager |
| Directing | Arthur Hiller | Director |
| Production | Stanley Rubin | Producer |
| Sound | Lyn Murray | Original Music Composer |
| Camera | Douglas Slocombe | Director of Photography |
| Editing | John Shirley | Editor |
| Production | Maude Spector | Casting |
| Art | Wilfred Shingleton | Production Design |
| Art | David Ffolkes | Set Decoration |
| Costume & Make-Up | Beatrice Dawson | Costume Design |
| Costume & Make-Up | Bob Lawrance | Makeup Artist |
| Costume & Make-Up | Pat McDermott | Hairstylist |
| Costume & Make-Up | Charles E. Parker | Makeup Artist |
| Production | Ronnie Bear | Production Manager |
| Directing | Urnee Robinson | Second Unit Director |
| Sound | John Cox | Sound |
| Sound | Christopher Lancaster | Sound Editor |
| Sound | George Stephenson | Sound |
| Camera | Bert Mason | Camera Operator |
| Camera | Chic Waterson | Camera Operator |
| Camera | Robin Vidgeon | Focus Puller |
| Costume & Make-Up | John Briggs | Wardrobe Supervisor |
| Costume & Make-Up | Jean Fairlie | Wardrobe Supervisor |
| Art | Maurice Binder | Title Designer |
| Crew | Lionel Blair | Choreographer |
| Directing | Angela Allen | Script Supervisor |
| Writing | William Peter Blatty | Screenplay |
| Writing | Arne Sultan | Original Story |
| Writing | Marvin Worth | Original Story |
| Directing | Ted Sturgis | Assistant Director |
