| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | Finding Nemo (2003) | £5,923,138 | £8,395,777 | £16,139,415 | -24% | 2 |
| 2 (10) |  | Kill Bill Volume 1 (2003) | £2,693,742 | £2,792,333 | £2,955,190 | 94% | 2 |
| 3 (new) |  | The League of Extraordinary Gentlemen (2003) | £2,005,435 | £2,005,435 | £2,005,435 | new | 1 |
| 4 (2) |  | Bad Boys II (2003) | £711,618 | £1,365,293 | £7,269,958 | -52% | 3 |
| 5 (4) |  | Calendar Girls (2003) | £681,748 | £1,651,420 | £16,515,918 | -30% | 6 |
| 6 (3) |  | Cabin Fever (2003) | £522,025 | £955,252 | £2,011,590 | -51% | 2 |
| 7 (new) | | Mystic River (2003) | £295,135 | £295,135 | £295,135 | new | 1 |
| 8 (5) |  | The Italian Job (2003) | £184,262 | £408,394 | £7,466,332 | -68% | 5 |
| 9 (6) |  | Down With Love (2003) | £178,399 | £434,655 | £1,782,029 | -59% | 3 |
| 10 (7) |  | Pirates of the Caribbean: The Curse of the Black Pearl (2003) | £177,335 | £324,307 | £27,608,977 | -50% | 11 |
| 11 (new) |  | Song For a Raggy Boy (2003) | £88,324 | £88,324 | £88,324 | new | 1 |
| 12 (12) | | Baghban (2003) | £71,766 | £120,044 | £393,908 | -22% | 3 |
| 13 (8) |  | Once Upon a Time In Mexico (2003) | £61,622 | £195,718 | £2,560,141 | -76% | 4 |
| 14 (9) |  | Bright Young Things (2003) | £60,732 | £171,306 | £869,053 | -65% | 3 |
| 15 (15) | | Spellbound (2003) | £45,688 | £91,703 | £149,438 | -21% | 2 |