| Rank | Title | Weekend |
|---|---|---|
| 1↔ (1) | Finding Nemo / 2003 | £5,923,138 |
| 2↑ (10) | Kill Bill Volume 1 / 2003 | £2,693,742 |
| 3 | The League of Extraordinary Gentlemen / 2003 | £2,005,435 |
| 4↓ (2) | Bad Boys II / 2003 | £711,618 |
| 5↓ (4) | Calendar Girls / 2003 | £681,748 |
| 6↓ (3) | Cabin Fever / 2003 | £522,025 |
| 7 | Mystic River / 2003 | £295,135 |
| 8↓ (5) | The Italian Job / 2003 | £184,262 |
| 9↓ (6) | Down With Love / 2003 | £178,399 |
| 10↓ (7) | Pirates of the Caribbean: The Curse of the Black Pearl / 2003 | £177,335 |
| 11 | Song For a Raggy Boy / 2003 | £88,324 |
| 12↔ (12) | Baghban / 2003 | £71,766 |
| 13↓ (8) | Once Upon a Time In Mexico / 2003 | £61,622 |
| 14↓ (9) | Bright Young Things / 2003 | £60,732 |
| 15↔ (15) | Spellbound / 2003 | £45,688 |
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