Domestic Box Office For July 1978
| Rank | Release | Gross | Max Th | Opening | % of Total | Open Th | Open | Close | Distributor |
|---|---|---|---|---|---|---|---|---|---|
| 1 | National Lampoon's Animal House | $120,091,123 | 12 | $276,538 | 0.2% | 12 | Jul 28 | - | Universal Pictures |
| 2 | Hooper | $78,000,000 | - | - | - | - | Jul 28 | - | Warner Bros. |
| 3 | Revenge of the Pink Panther | $49,579,269 | - | - | - | - | Jul 19 | - | United Artists |
| 4 | Foul Play | $44,999,621 | - | - | - | - | Jul 19 | - | Paramount Pictures |
| 5 | Sgt. Pepper's Lonely Hearts Club Band | $20,378,470 | - | - | - | - | Jul 21 | - | Universal Pictures |
| 6 | International Velvet | $7,009,238 | - | - | - | - | Jul 12 | - | Metro-Goldwyn-Mayer (MGM) |
