UK Box Office 21st May, 1999
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (new) |  | She's All That (1999) | £1,200,565 | £1,200,565 | £1,200,565 | new | 1 |
| 2 (2) |  | I Still Know What You Did Last Summer (1999) | £261,802 | £455,225 | £2,054,619 | -46% | 3 |
| 3 (1) |  | Forces of Nature (1999) | £259,887 | £456,318 | £1,954,110 | -47% | 3 |
| 4 (new) |  | Apt Pupil (1998) | £250,255 | £250,255 | £250,255 | new | 1 |
| 5 (3) |  | The Waterboy (1999) | £208,300 | £340,841 | £2,856,383 | -43% | 4 |
| 6 (4) |  | Best Laid Plans (1999) | £164,695 | £295,919 | £555,140 | -36% | 2 |
| 7 (new) |  | Notting Hill (1999) | £152,532 | £152,532 | £152,532 | new | 1 |
| 8 (new) |  | The Corruptor (1999) | £139,738 | £139,738 | £139,738 | new | 1 |
| 9 (new) |  | A Simple Plan (1999) | £139,087 | £139,087 | £139,087 | new | 1 |
| 10 (8) |  | The Rugrats Movie (1998) | £136,668 | £152,813 | £12,216,848 | -15% | 9 |
| 11 (5) |  | True Crime (1999) | £107,209 | £196,568 | £385,717 | -43% | 2 |
| 12 (10) |  | An Ideal Husband (1999) | £99,512 | £192,045 | £2,473,140 | -28% | 6 |
| 13 (9) |  | 8mm (1999) | £90,781 | £173,619 | £2,391,380 | -43% | 5 |
| 14 (6) |  | eXistenZ (1999) | £90,564 | £178,490 | £1,352,161 | -49% | 4 |
| 15 (7) |  | Shuang Long Hui (1992) | £83,935 | £152,869 | £323,530 | -51% | 2 |