| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | Finding Nemo (2003) | £3,887,996 | £5,689,978 | £21,829,393 | -34% | 3 |
| 2 (2) |  | Kill Bill Volume 1 (2003) | £1,786,168 | £3,323,887 | £6,279,077 | -34% | 3 |
| 3 (new) |  | Intolerable Cruelty (2003) | £1,555,684 | £1,555,684 | £1,555,684 | new | 1 |
| 4 (3) |  | The League of Extraordinary Gentlemen (2003) | £1,212,866 | £1,986,566 | £3,992,001 | -40% | 2 |
| 5 (5) |  | Calendar Girls (2003) | £464,952 | £1,150,392 | £17,666,310 | -32% | 7 |
| 6 (4) |  | Bad Boys II (2003) | £366,679 | £666,274 | £7,936,232 | -48% | 4 |
| 7 (new) |  | Holes (2003) | £275,884 | £275,884 | £275,884 | new | 1 |
| 8 (7) | | Mystic River (2003) | £275,440 | £453,976 | £749,111 | -7% | 2 |
| 9 (6) |  | Cabin Fever (2003) | £257,202 | £473,867 | £2,485,457 | -51% | 3 |
| 10 (new) |  | Secondhand Lions (2003) | £200,851 | £200,851 | £200,851 | new | 1 |
| 11 (10) |  | Pirates of the Caribbean: The Curse of the Black Pearl (2003) | £113,956 | £189,719 | £27,798,696 | -36% | 12 |
| 12 (11) |  | Song For a Raggy Boy (2003) | £65,374 | £128,204 | £216,528 | -26% | 2 |
| 13 (9) |  | Down With Love (2003) | £61,775 | £176,123 | £1,958,152 | -65% | 4 |
| 14 (8) |  | The Italian Job (2003) | £56,880 | £130,992 | £7,597,324 | -69% | 6 |
| 15 (12) | | Baghban (2003) | £54,375 | £96,691 | £490,599 | -24% | 4 |