UK Box Office 9th January, 1981
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) |  | Any Which Way You Can (1981) | £997,257 | £997,257 | £997,257 | new | 1 |
| 2 (1) |  | Flash Gordon (1980) | £888,458 | £1,199,418 | £5,853,650 | -11% | 5 |
| 3 (2) |  | The Blue Lagoon (1980) | £94,725 | £127,879 | £1,449,200 | -56% | 4 |