UK Box Office 15th September, 1978
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) |  | Grease (1978) | £732,080 | £732,080 | £732,080 | new | 1 |
| 2 (new) |  | Foul Play (1978) | £331,296 | £331,296 | £331,296 | new | 1 |
| 3 (1) | The Silent Partner (1978) | £149,717 | £194,632 | £494,066 | -50% | 2 | |
| 4 (2) |  | Herbie Goes to Monte Carlo (1978) | £99,145 | £143,760 | £1,393,985 | -23% | 4 |
| 5 (3) | Convoy (1978) | £41,274 | £53,656 | £730,546 | -50% | 4 | |
| 6 (4) | The Legacy (1978) | £32,885 | £47,683 | £343,645 | -58% | 3 | |
| 7 (5) |  | Midnight Express (1978) | £8,440 | £11,816 | £919,537 | -55% | 6 |
| 8 (6) |  | The Wild Geese (1978) | £1,689 | £2,196 | £1,667,364 | -44% | 11 |