This is a list of films which have placed number one at the weekend box office in the United Kingdom during 2003.
| Weekend End Date | Film | Box Office | Notes | |
|---|---|---|---|---|
| 1 | £5,774,170 | |||
| 2 | £3,728,876 | |||
| 3 | 8 Mile | £4,440,334 | ||
| 4 | £2,514,467 | |||
| 5 | Catch Me If You Can | £3,720,957 | ||
| 6 | Two Weeks Notice | £2,636,050 | ||
| 7 | £2,189,331 | |||
| 8 | The Ring | £2,200,084 | ||
| 9 | £1,692,154 | |||
| 10 | Maid in Manhattan | £2,424,584 | ||
| 11 | £1,281,755 | |||
| 12 | Just Married | £973,469 | ||
| 13 | The Recruit | £923,834 | ||
| 14 | £770,014 | |||
| 15 | Johnny English | £3,435,342 | ||
| 16 | £2,529,665 | |||
| 17 | £2,279,100 | |||
| 18 | X2 | £7,037,861 | ||
| 19 | £3,079,985 | |||
| 20 | £2,115,011 | |||
| 21 | The Matrix Reloaded | £12,165,276 | ||
| 22 | £3,783,905 | |||
| 23 | £2,485,938 | |||
| 24 | £1,071,551 | |||
| 25 | 2 Fast 2 Furious | £2,747,875 | ||
| 26 | Bruce Almighty | £7,260,467 | ||
| 27 | £3,273,078 | |||
| 28 | £1,581,273 | |||
| 29 | Hulk | £3,529,440 | ||
| 30 | £1,384,426 | |||
| 31 | £6,080,369 | |||
| 32 | £3,765,450 | |||
| 33 | American Wedding | £4,151,788 | ||
| 34 | £2,180,783 | |||
| 35 | Pirates of the Caribbean: The Curse of the Black Pearl | £2,037,014 | ||
| 36 | £1,542,745 | |||
| 37 | Calendar Girls | £1,762,505 | ||
| 38 | The Italian Job | £2,294,027 | ||
| 39 | Calendar Girls | £1,761,985 | ||
| 40 | Bad Boys II | £3,175,258 | ||
| 41 | Finding Nemo | £7,381,962 | ||
| 42 | £5,923,138 | |||
| 43 | £3,887,996 | |||
| 44 | £3,393,575 | |||
| 45 | The Matrix Revolutions | £8,712,350 | ||
| 46 | £2,575,595 | |||
| 47 | Love Actually | £6,657,479 | ||
| 48 | £4,660,595 | |||
| 49 | £3,202,417 | |||
| 50 | £2,273,706 | |||
| 51 | £15,021,761 | |||
| 52 | £7,149,427 | |||