| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | LoveActually (2003) | £6,657,479 | £6,657,479 | £6,657,479 | new | 1 |
| 2 (1) |  | The Matrix Revolutions (2003) | £1,158,971 | £2,137,768 | £15,581,005 | -55% | 3 |
| 3 (2) |  | Finding Nemo (2003) | £808,327 | £1,073,588 | £35,994,590 | -33% | 7 |
| 4 (3) |  | Seabiscuit (2003) | £334,875 | £657,878 | £2,524,859 | -41% | 3 |
| 5 (5) |  | Kill Bill Volume 1 (2003) | £256,827 | £506,235 | £10,971,227 | -39% | 7 |
| 6 (4) |  | Intolerable Cruelty (2003) | £247,035 | £495,506 | £6,236,482 | -53% | 5 |
| 7 (6) |  | The Texas Chainsaw Massacre (2003) | £185,050 | £378,525 | £3,686,026 | -52% | 4 |
| 8 (8) |  | The League of Extraordinary Gentlemen (2003) | £158,395 | £258,326 | £7,191,439 | -44% | 6 |
| 9 (7) | | In America (2003) | £156,952 | £340,335 | £1,608,189 | -54% | 4 |
| 10 (9) |  | Calendar Girls (2003) | £111,540 | £293,508 | £20,010,892 | -44% | 11 |
| 11 (12) | | Mystic River (2003) | £70,577 | £126,650 | £1,630,553 | -27% | 6 |
| 12 (new) |  | Master and Commander: The Far Side of the World (2003) | £61,056 | £61,056 | £61,056 | new | 1 |
| 13 (13) |  | Holes (2003) | £58,432 | £70,343 | £1,331,449 | -34% | 5 |
| 14 (10) |  | In the Cut (2003) | £55,213 | £121,764 | £953,853 | -57% | 4 |
| 15 (11) |  | The Medallion (2003) | £48,293 | £88,005 | £194,802 | -55% | 2 |