| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) | ![]() | Antz (1998) | £978,414 | £1,305,671 | £7,054,968 | -28% | 4 |
| 2 (new) | ![]() | Out of Sight (1998) | £869,255 | £869,255 | £869,255 | new | 1 |
| 3 (2) | ![]() | Blade (1998) | £669,477 | £1,126,186 | £4,575,614 | -37% | 3 |
| 4 (3) | ![]() | Ronin (1998) | £521,373 | £937,981 | £1,813,526 | -40% | 2 |
| 5 (new) | ![]() | The Negotiator (1998) | £447,191 | £447,191 | £447,191 | new | 1 |
| 6 (4) | ![]() | Small Soldiers (1998) | £219,453 | £260,022 | £5,663,110 | -28% | 6 |
| 7 (6) | ![]() | There's Something About Mary (1998) | £209,891 | £335,506 | £15,046,312 | -20% | 10 |
| 8 (7) | ![]() | Mulan (1998) | £179,034 | £205,816 | £8,541,509 | -25% | 8 |
| 9 (5) | ![]() | The Exorcist (1973) Rerelease | £148,119 | £275,898 | £7,021,983 | -48% | 52 |
| 10 (10) | ![]() | The Truman Show (1998) | £95,209 | £150,264 | £9,771,416 | -35% | 8 |
| 11 (14) | ![]() | Saving Private Ryan (1998) | £78,514 | £134,923 | £17,600,309 | -20% | 12 |
| 12 (13) | ![]() | My Name Is Joe (1998) | £76,871 | £138,550 | £548,661 | -30% | 3 |
| 13 (12) | ![]() | Les Misérables (1998) | £59,214 | £124,743 | £243,307 | -50% | 2 |
| 14 (new) | ![]() | Twice Upon a Yesterday (1998) | £57,787 | £57,787 | £57,787 | new | 1 |
| 15 (15) | ![]() | Elizabeth (1998) | £9,003 | £9,003 | £5,301,693 | -29% | 9 |