| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Elizabeth (1998) | £2,778,432 | £2,778,432 | £2,778,432 | new | 1 |
| 2 (1) |  | There's Something About Mary (1998) | £2,026,662 | £3,162,646 | £5,239,057 | -2% | 2 |
| 3 (2) |  | Saving Private Ryan (1998) | £1,367,408 | £2,409,658 | £12,170,437 | -19% | 4 |
| 4 (3) |  | Lethal Weapon 4 (1998) | £804,147 | £1,357,885 | £5,433,403 | -32% | 3 |
| 5 (4) |  | Lock, Stock & Two Smoking Barrels (1998) | £624,942 | £1,004,087 | £8,202,092 | -5% | 6 |
| 6 (new) |  | Mercury Rising (1998) | £457,292 | £457,292 | £457,292 | new | 1 |
| 7 (5) |  | Doctor Dolittle (1998) | £301,944 | £368,159 | £18,778,109 | -12% | 10 |
| 8 (6) |  | Armageddon (1998) | £181,199 | £281,021 | £16,259,928 | -24% | 9 |
| 9 (7) |  | The Horse Whisperer (1998) | £135,847 | £311,167 | £5,294,123 | -37% | 6 |
| 10 (8) |  | The Land Girls (1998) | £123,194 | £273,113 | £680,148 | -5% | 5 |
| 11 (new) |  | Divorcing Jack (1998) | £121,394 | £121,394 | £121,394 | new | 1 |
| 12 (10) | | Dancing At Lughnasa (1998) | £101,140 | £190,174 | £287,251 | 4% | 2 |
| 13 (new) |  | Buffalo 66 (1998) | £52,968 | £52,968 | £52,968 | new | 1 |
| 14 (11) |  | Lost In Space (1998) | £42,412 | £90,827 | £10,664,453 | -21% | 10 |
| 15 (13) |  | Godzilla (1998) | £35,142 | £94,915 | £15,974,736 | -16% | 12 |