| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Small Soldiers (1998) | £1,137,725 | £1,137,725 | £1,137,725 | new | 1 |
| 2 (2) |  | Mulan (1998) | £1,132,150 | £1,615,205 | £3,513,985 | -31% | 3 |
| 3 (1) |  | The Truman Show (1998) | £1,096,394 | £1,716,408 | £6,571,775 | -35% | 3 |
| 4 (new) |  | Halloween H20: Twenty Years Later (1998) | £1,038,646 | £1,038,646 | £1,038,646 | new | 1 |
| 5 (3) |  | There's Something About Mary (1998) | £908,850 | £1,510,423 | £11,490,304 | -29% | 5 |
| 6 (6) |  | A Perfect Murder (1998) | £462,449 | £779,597 | £1,411,889 | -27% | 2 |
| 7 (5) |  | Saving Private Ryan (1998) | £423,342 | £807,773 | £15,956,810 | -37% | 7 |
| 8 (7) |  | Lock, Stock & Two Smoking Barrels (1998) | £311,025 | £499,353 | £10,113,063 | -16% | 9 |
| 9 (4) |  | Elizabeth (1998) | £257,262 | £257,262 | £5,119,518 | -63% | 4 |
| 10 (10) |  | Kuch Kuch Hota Hai (1998) | £160,004 | £243,894 | £424,884 | -12% | 2 |
| 11 (new) |  | Velvet Goldmine (1998) | £156,050 | £156,050 | £156,050 | new | 1 |
| 12 (8) |  | Lethal Weapon 4 (1998) | £141,391 | £272,644 | £7,006,948 | -50% | 6 |
| 13 (9) |  | Ever After (1998) | £105,388 | £192,600 | £843,991 | -48% | 3 |
| 14 (11) |  | Doctor Dolittle (1998) | £105,228 | £140,184 | £19,339,272 | -32% | 13 |
| 15 (14) |  | Divorcing Jack (1998) | £36,050 | £70,997 | £375,657 | -37% | 4 |