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Vincent Price as Simon Cordier |
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Nancy Kovack as Odette Mallotte |
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Chris Warfield as Paul Duclasse |
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Elaine Devry as Jeanne D'Arville |
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Ian Wolfe as Pierre |
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Stephen Roberts as Captain Robert Rennedon |
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Lewis Martin as Father Raymonde |
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Mary Adams as Louise |
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Edward Colmans as Andre D'Arville |
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Nelson Olmsted as Dr. Borman |
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Harvey Stephens as Louis Girot |
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Don Brodie as Marcel |
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Joseph Ruskin as The Horla (voice) |
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Dick Wilson as |
| Directing | Reginald Le Borg | Director |
| Art | Daniel Haller | Art Direction |
| Production | Robert E. Kent | Producer |
| Writing | Robert E. Kent | Screenplay |
| Sound | Alfred R. Bird | Sound Effects Editor |
| Sound | Edna Bullock | Music Editor |
| Crew | Norman Breedlove | Special Effects |
| Art | Irving W. Sindler | Property Master |
| Sound | Ralph Butler | Sound |
| Art | Lowell Grant | Sculptor |
| Sound | Richard LaSalle | Original Music Composer |
| Camera | Ellis W. Carter | Director of Photography |
| Editing | Grant Whytock | Editor |
| Art | Victor A. Gangelin | Set Decoration |
| Costume & Make-Up | Marjorie Corso | Costume Design |
| Directing | Jane Ficker | Script Supervisor |
| Writing | Guy de Maupassant | Short Story |
| Production | Joseph Small | Production Manager |
| Directing | Al Westen | Assistant Director |
| Production | Edward Small | Producer |
| Costume & Make-Up | Ted Coodley | Makeup Artist |
| Costume & Make-Up | Carmen Dirigo | Hairstylist |
