| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | American Pie: The Wedding (2003) | £4,151,788 | £4,151,788 | £4,151,788 | new | 1 |
| 2 (1) |  | Pirates of the Caribbean: The Curse of the Black Pearl (2003) | £2,604,351 | £5,805,326 | £9,570,776 | -31% | 2 |
| 3 (2) |  | Terminator 3: Rise of the Machines (2003) | £1,390,236 | £3,150,725 | £14,550,687 | -38% | 3 |
| 4 (new) |  | Freddy Vs. Jason (2003) | £785,870 | £785,870 | £785,870 | new | 1 |
| 5 (4) |  | Spy Kids 3D: Game Over (2003) | £517,081 | £1,282,633 | £3,697,440 | -8% | 3 |
| 6 (3) |  | Legally Blonde 2: Red, White & Blonde (2003) | £366,574 | £1,040,020 | £4,176,088 | -36% | 3 |
| 7 (5) |  | Rugrats Go Wild (2003) | £307,402 | £832,625 | £1,192,630 | -15% | 2 |
| 8 (7) |  | Piglets Big Movie (2003) | £177,722 | £446,265 | £3,421,116 | -9% | 8 |
| 9 (8) |  | Bruce Almighty (2003) | £113,290 | £328,049 | £23,372,048 | -39% | 8 |
| 10 (10) |  | Veronica Guerin (2003) | £109,025 | £343,688 | £2,748,635 | -34% | 6 |
| 11 (6) |  | What a Girl Wants (2003) | £108,339 | £395,849 | £616,066 | -51% | 2 |
| 12 (9) |  | Koi... Mil Gaya (2003) | £89,440 | £190,710 | £367,810 | -49% | 2 |
| 13 (11) |  | Sinbad Legend of the Seven Seas (2003) | £85,258 | £218,744 | £2,347,607 | -9% | 4 |
| 14 (re) | | Goodbye Lenin (2003) | £57,391 | £57,391 | £577,190 | RE | 3 |
| 15 (15) |  | Respiro Grazias Island (2003) | £57,225 | £110,793 | £163,120 | 9% | 2 |