Domestic Box Office For September 1975
| Rank | Release | Gross | Max Th | Opening | % of Total | Open Th | Open | Close | Distributor |
|---|---|---|---|---|---|---|---|---|---|
| 1 | The Rocky Horror Picture Show | $112,892,319 | - | - | - | - | Sep 26 | - | Twentieth Century Fox |
| 2 | Dog Day Afternoon | $50,000,000 | - | - | - | - | Sep 21 | - | Warner Bros. |
| 3 | Three Days of the Condor | $27,476,252 | - | - | - | - | Sep 24 | - | Paramount Pictures |
| 4 | Give 'em Hell, Harry! | $11,000,000 | - | - | - | - | Sep 18 | - | - |
