| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | The Truman Show (1998) | £2,210,999 | £2,210,999 | £2,210,999 | new | 1 |
| 2 (2) |  | There's Something About Mary (1998) | £1,620,580 | £2,683,469 | £7,922,526 | -20% | 3 |
| 3 (1) |  | Elizabeth (1998) | £1,389,216 | £1,389,216 | £4,167,648 | -50% | 2 |
| 4 (3) |  | Saving Private Ryan (1998) | £931,140 | £1,728,337 | £13,898,774 | -32% | 5 |
| 5 (4) |  | Lethal Weapon 4 (1998) | £440,078 | £809,889 | £6,243,292 | -45% | 4 |
| 6 (5) |  | Lock, Stock & Two Smoking Barrels (1998) | £436,772 | £794,032 | £8,996,124 | -30% | 7 |
| 7 (new) |  | Ever After (1998) | £305,362 | £305,362 | £305,362 | new | 1 |
| 8 (6) |  | Mercury Rising (1998) | £203,789 | £408,128 | £865,420 | -55% | 2 |
| 9 (7) |  | Doctor Dolittle (1998) | £184,797 | £224,086 | £19,002,195 | -39% | 11 |
| 10 (new) |  | Mulan (1998) | £111,949 | £111,949 | £111,949 | new | 1 |
| 11 (10) |  | The Land Girls (1998) | £87,222 | £204,117 | £884,265 | -29% | 6 |
| 12 (8) |  | Armageddon (1998) | £74,473 | £246,677 | £16,506,605 | -59% | 10 |
| 13 (12) | | Dancing At Lughnasa (1998) | £64,038 | £134,189 | £421,440 | -37% | 3 |
| 14 (9) |  | The Horse Whisperer (1998) | £47,841 | £154,054 | £5,448,177 | -65% | 7 |
| 15 (11) |  | Divorcing Jack (1998) | £40,365 | £102,311 | £223,705 | -67% | 2 |