| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | Bad Boys II (2003) | £3,175,258 | £3,175,258 | £3,175,258 | new | 1 |
| 2 (1) |  | Calendar Girls (2003) | £1,415,753 | £3,158,303 | £12,651,517 | -20% | 4 |
| 3 (2) |  | The Italian Job (2003) | £1,004,722 | £1,558,084 | £6,155,782 | -32% | 3 |
| 4 (new) |  | Down With Love (2003) | £599,047 | £599,047 | £599,047 | new | 1 |
| 5 (5) |  | Pirates of the Caribbean: The Curse of the Black Pearl (2003) | £598,145 | £885,284 | £26,736,308 | -23% | 9 |
| 6 (4) |  | Once Upon a Time In Mexico (2003) | £532,327 | £981,012 | £1,827,112 | -37% | 2 |
| 7 (3) |  | Underworld (2003) | £451,248 | £852,566 | £3,918,220 | -48% | 3 |
| 8 (new) |  | Bright Young Things (2003) | £327,293 | £327,293 | £327,293 | new | 1 |
| 9 (6) |  | Matchstick Men (2003) | £257,947 | £516,215 | £1,163,698 | -60% | 2 |
| 10 (10) |  | Spy Kids 3D: Game Over (2003) | £174,757 | £194,664 | £7,058,158 | -2% | 10 |
| 11 (8) | | Young Adam (2003) | £144,577 | £301,556 | £530,248 | -37% | 2 |
| 12 (new) | | Baghban (2003) | £118,528 | £118,528 | £118,528 | new | 1 |
| 13 (7) |  | American Pie: The Wedding (2003) | £117,584 | £245,650 | £16,921,876 | -55% | 8 |
| 14 (11) |  | The Lizzie Mcguire Movie (2003) | £113,826 | £126,634 | £1,750,367 | -20% | 6 |
| 15 (15) |  | Rugrats Go Wild (2003) | £93,031 | £104,267 | £3,148,982 | 15% | 8 |