| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (new) |  | The Lord of the Rings: The Return of the King (2003) | £15,021,761 | £15,021,761 | £15,021,761 | new | 1 |
| 2 (2) |  | Elf (2003) | £1,388,207 | £2,089,610 | £12,214,600 | -25% | 4 |
| 3 (1) |  | LoveActually (2003) | £1,311,935 | £2,704,731 | £27,871,625 | -42% | 5 |
| 4 (new) |  | Freaky Friday (2003) | £1,214,559 | £1,214,559 | £1,214,559 | new | 1 |
| 5 (4) |  | Brother Bear (2003) | £515,625 | £760,491 | £2,595,078 | -29% | 3 |
| 6 (3) |  | S.W.A.T. (2003) | £403,001 | £814,077 | £4,359,432 | -58% | 3 |
| 7 (5) |  | Master and Commander: The Far Side of the World (2003) | £283,584 | £652,262 | £5,882,795 | -60% | 5 |
| 8 (new) |  | Good Boy! (2003) | £146,354 | £146,354 | £146,354 | new | 1 |
| 9 (10) | | Touching the Void (2003) | £97,671 | £190,253 | £305,585 | -15% | 2 |
| 10 (6) |  | Kal Ho Naa Ho (2003) | £93,173 | £152,911 | £1,294,079 | -46% | 4 |
| 11 (8) |  | The Fighting Temptations (2003) | £47,997 | £120,892 | £272,886 | -68% | 2 |
| 12 (11) |  | Finding Nemo (2003) | £42,129 | £65,163 | £37,178,973 | -63% | 11 |
| 13 (7) |  | The Matrix Revolutions (2003) | £37,040 | £122,902 | £17,754,338 | -78% | 7 |
| 14 (new) | | Munnabhai M.B.B.S. (2003) | £31,760 | £31,760 | £31,760 | new | 1 |
| 15 (12) | | Dead End (2003) | £28,089 | £54,671 | £106,801 | -46% | 2 |