| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | I Still Know What You Did Last Summer (1999) | £802,498 | £802,498 | £802,498 | new | 1 |
| 2 (new) |  | Forces of Nature (1999) | £730,208 | £730,208 | £730,208 | new | 1 |
| 3 (1) |  | The Waterboy (1999) | £620,141 | £1,052,665 | £1,939,910 | -30% | 2 |
| 4 (4) |  | eXistenZ (1999) | £286,137 | £502,990 | £865,854 | -21% | 2 |
| 5 (2) |  | 8mm (1999) | £282,815 | £510,510 | £1,921,148 | -25% | 3 |
| 6 (5) |  | Message In a Bottle (1999) | £225,717 | £443,488 | £1,666,233 | -35% | 3 |
| 7 (7) |  | The Rugrats Movie (1998) | £221,943 | £362,431 | £11,880,860 | -10% | 7 |
| 8 (3) |  | The Faculty (1999) | £217,179 | £387,567 | £4,135,599 | -40% | 5 |
| 9 (6) |  | An Ideal Husband (1999) | £204,207 | £372,985 | £2,018,994 | -21% | 4 |
| 10 (8) |  | Waking Ned Devine (1999) | £137,156 | £253,163 | £6,511,447 | -28% | 8 |
| 11 (new) |  | Swing (1999) | £132,138 | £132,138 | £132,138 | new | 1 |
| 12 (10) |  | Mighty Joe Young (1999) | £107,620 | £180,088 | £3,875,316 | 12% | 7 |
| 13 (re) | | Happiness (1999) | £65,311 | £65,311 | £365,332 | re | 3 |
| 14 (9) |  | Shakespeare In Love (1999) | £65,184 | £461,953 | £20,407,662 | -41% | 15 |
| 15 (12) |  | Payback (1999) | £53,063 | £100,873 | £4,707,414 | -42% | 7 |