| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | LoveActually (2003) | £3,202,417 | £5,956,823 | £21,079,416 | -31% | 3 |
| 2 (2) |  | Elf (2003) | £2,318,282 | £3,096,066 | £7,634,506 | -49% | 2 |
| 3 (new) |  | S.W.A.T. (2003) | £1,960,281 | £1,960,281 | £1,960,281 | new | 1 |
| 4 (3) |  | Master and Commander: The Far Side of the World (2003) | £1,102,031 | £2,031,596 | £3,971,205 | -40% | 3 |
| 5 (new) |  | Brother Bear (2003) | £887,321 | £887,321 | £887,321 | new | 1 |
| 6 (4) |  | The Matrix Revolutions (2003) | £282,040 | £509,700 | £17,247,430 | -56% | 5 |
| 7 (new) | | Timeline (2003) | £279,505 | £279,505 | £279,505 | new | 1 |
| 8 (6) |  | Kal Ho Naa Ho (2003) | £271,668 | £438,247 | £875,037 | -38% | 2 |
| 9 (5) |  | Finding Nemo (2003) | £187,095 | £275,066 | £36,960,778 | -62% | 9 |
| 10 (9) |  | interMission (2003) | £62,880 | £132,208 | £1,961,709 | -48% | 8 |
| 11 (10) | | Spin the Bottle (2003) | £58,867 | £122,315 | £217,848 | -38% | 2 |
| 12 (new) |  | Thirteen (2003) | £53,553 | £53,553 | £53,553 | new | 1 |
| 13 (8) |  | Kill Bill Volume 1 (2003) | £53,256 | £131,057 | £11,383,120 | -58% | 9 |
| 14 (7) |  | Seabiscuit (2003) | £38,921 | £124,841 | £2,971,592 | -73% | 5 |
| 15 (new) | | Wilbur Wants to Kill Himself (2003) | £37,461 | £37,461 | £37,461 | new | 1 |