| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | The Matrix Revolutions (2003) | £2,575,595 | £4,730,887 | £13,443,237 | -70% | 2 |
| 2 (2) |  | Finding Nemo (2003) | £1,201,715 | £1,585,804 | £34,921,002 | -28% | 6 |
| 3 (3) |  | Seabiscuit (2003) | £571,485 | £1,009,813 | £1,866,981 | -33% | 2 |
| 4 (4) |  | Intolerable Cruelty (2003) | £520,176 | £878,207 | £5,740,976 | -24% | 4 |
| 5 (6) |  | Kill Bill Volume 1 (2003) | £421,252 | £786,991 | £10,464,992 | -27% | 6 |
| 6 (5) |  | The Texas Chainsaw Massacre (2003) | £389,410 | £749,990 | £3,307,501 | -41% | 3 |
| 7 (8) | | In America (2003) | £340,076 | £514,256 | £1,267,854 | 19% | 3 |
| 8 (7) |  | The League of Extraordinary Gentlemen (2003) | £284,210 | £441,383 | £6,933,113 | -32% | 5 |
| 9 (9) |  | Calendar Girls (2003) | £200,734 | £457,711 | £19,717,384 | -15% | 10 |
| 10 (10) |  | In the Cut (2003) | £129,337 | £234,601 | £832,089 | -25% | 3 |
| 11 (new) |  | The Medallion (2003) | £106,797 | £106,797 | £106,797 | new | 1 |
| 12 (12) | | Mystic River (2003) | £97,189 | £168,441 | £1,503,903 | -11% | 5 |
| 13 (11) |  | Holes (2003) | £88,745 | £104,404 | £1,261,106 | -29% | 4 |
| 14 (new) |  | The Mother (2003) | £59,077 | £59,077 | £59,077 | new | 1 |
| 15 (new) |  | The Singing Detective (2003) | £42,122 | £42,122 | £42,122 | new | 1 |