UK Box Office 22nd December, 1978
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) |  | Superman (1978) | £6,464,193 | £8,403,451 | £9,404,740 | 85% | 2 |
| 2 (2) |  | Watership Down (1978) | £168,879 | £244,875 | £599,520 | -52% | 2 |
| 3 (3) | Piranha (1978) | £39,247 | £56,908 | £684,982 | -17% | 5 | |
| 4 (4) |  | Heaven Can Wait (1978) | £17,122 | £23,115 | £1,297,922 | -17% | 9 |
| 5 (5) | Force 10 From Navarone (1978) | £4,126 | £5,364 | £242,524 | -38% | 6 | |
| 6 (6) |  | The Cat From Outer Space (1978) | £1,886 | £2,452 | £811,644 | -47% | 9 |
| 7 (7) |  | Grease (1978) | £1,029 | £1,492 | £4,078,157 | -41% | 15 |