UK Box Office 29th September, 1978
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) |  | Grease (1978) | £599,336 | £869,037 | £2,902,249 | -40% | 3 |
| 2 (2) |  | Foul Play (1978) | £82,824 | £107,671 | £679,157 | -50% | 3 |
| 3 (3) | The Silent Partner (1978) | £37,430 | £50,531 | £649,400 | -50% | 4 | |
| 4 (4) |  | Herbie Goes to Monte Carlo (1978) | £30,506 | £44,234 | £1,491,757 | -23% | 6 |
| 5 (new) | Must Wear Tights (1978) | £18,545 | £18,545 | £18,545 | new | 1 | |
| 6 (5) | Convoy (1978) | £10,319 | £14,963 | £775,433 | -50% | 6 | |
| 7 (6) | The Legacy (1978) | £5,709 | £7,993 | £370,136 | -58% | 5 | |
| 8 (8) |  | The Wild Geese (1978) | £521 | £677 | £1,669,354 | -44% | 13 |