| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (1) |  | American Pie: The Wedding (2003) | £2,180,783 | £4,824,429 | £8,976,217 | -47% | 2 |
| 2 (2) |  | Pirates of the Caribbean: The Curse of the Black Pearl (2003) | £2,091,524 | £4,549,934 | £14,120,710 | -20% | 3 |
| 3 (new) |  | Lara Croft: Tomb Raider - The Cradle of Life (2003) | £1,524,676 | £1,524,676 | £1,524,676 | new | 1 |
| 4 (3) |  | Terminator 3: Rise of the Machines (2003) | £792,364 | £1,868,177 | £16,418,864 | -43% | 4 |
| 5 (4) |  | Freddy Vs. Jason (2003) | £440,799 | £901,860 | £1,687,730 | -44% | 2 |
| 6 (5) |  | Spy Kids 3D: Game Over (2003) | £420,315 | £1,102,686 | £4,800,126 | -19% | 4 |
| 7 (new) |  | Confidence (2003) | £325,685 | £325,685 | £325,685 | new | 1 |
| 8 (7) |  | Rugrats Go Wild (2003) | £235,298 | £678,868 | £1,871,498 | -23% | 3 |
| 9 (new) |  | The Man Who Sued God (2003) | £195,418 | £195,418 | £195,418 | new | 1 |
| 10 (6) |  | Legally Blonde 2: Red, White & Blonde (2003) | £186,846 | £600,465 | £4,776,553 | -49% | 4 |
| 11 (8) |  | Piglets Big Movie (2003) | £166,858 | £426,428 | £3,847,544 | -6% | 9 |
| 12 (new) | | Swimming Pool (2003) | £119,092 | £119,092 | £119,092 | new | 1 |
| 13 (10) |  | Veronica Guerin (2003) | £69,134 | £194,010 | £2,942,645 | -37% | 7 |
| 14 (12) |  | Koi... Mil Gaya (2003) | £61,203 | £121,926 | £489,736 | -32% | 3 |
| 15 (13) |  | Sinbad Legend of the Seven Seas (2003) | £56,720 | £184,352 | £2,531,959 | -33% | 5 |