| Release Date | 11 February 1971 |
| Budget | $1,000,000 |
| Tagline | It's nine times more suspenseful! |
| Genre | Horror, Mystery, Thriller |
| Country | ItalyFranceWest Germany |
| Filming Locations | Cinecittà Studios, Cinecittà, Rome, Lazio, Italy |
| Language | Italian |
| Sound Mix | Mono |
| Color | Color |
| Film Type | Feature |
| Film Class | Giallo, Whodunit, Psychological Thriller |
| Themes | Amateur Sleuths, Serial Killers |
| Tones | Stylized, Deliberate, Chilly, Eerie, Slick, Ominous |
| Tags | Anchorperson, Blind, Detective, Handicap, Investigation, Investigator, Kill, Murder, Sadist, Serial Killer |
The Cat o' Nine Tails (Italian: ) is a 1971 Italian giallo thriller film written and directed by Dario Argento; it was his second film as director.