| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (re) | ![]() | The Exorcist (1973) Rerelease | £2,186,977 | £2,186,977 | £2,776,510 | re | 48 |
| 2 (2) | ![]() | Mulan (1998) | £1,227,279 | £3,451,571 | £6,965,556 | 8% | 4 |
| 3 (1) | ![]() | Small Soldiers (1998) | £1,130,015 | £2,663,937 | £3,801,662 | -1% | 2 |
| 4 (4) | ![]() | Halloween H20: Twenty Years Later (1998) | £911,638 | £1,515,718 | £2,554,364 | -12% | 2 |
| 5 (3) | ![]() | The Truman Show (1998) | £733,267 | £1,625,355 | £8,197,130 | -33% | 4 |
| 6 (5) | ![]() | There's Something About Mary (1998) | £634,821 | £1,343,887 | £12,834,191 | -30% | 6 |
| 7 (new) | ![]() | Still Crazy (1998) | £329,727 | £329,727 | £329,727 | new | 1 |
| 8 (7) | ![]() | Saving Private Ryan (1998) | £281,502 | £655,685 | £16,612,495 | -34% | 8 |
| 9 (6) | ![]() | A Perfect Murder (1998) | £263,861 | £569,346 | £1,981,235 | -43% | 3 |
| 10 (new) | Primary Colors (1998) | £238,918 | £238,918 | £238,918 | new | 1 | |
| 11 (8) | ![]() | Lock, Stock & Two Smoking Barrels (1998) | £209,905 | £461,595 | £10,574,658 | -33% | 10 |
| 12 (10) | ![]() | Kuch Kuch Hota Hai (1998) | £142,787 | £266,031 | £690,915 | -11% | 3 |
| 13 (14) | ![]() | Doctor Dolittle (1998) | £101,716 | £515,326 | £19,854,598 | -3% | 14 |
| 14 (9) | ![]() | Elizabeth (1998) | £95,282 | £95,282 | £5,214,800 | -63% | 5 |
| 15 (11) | ![]() | Velvet Goldmine (1998) | £69,084 | £165,352 | £321,402 | -56% | 2 |