British Box Office For May 2003
| Rank | Release | Gross | Theaters | Total Gross | Release Date | Distributor |
|---|---|---|---|---|---|---|
| 1 | X2: X-Men United | $31,218,127 | 468 | $34,125,442 | May 1 | - |
| 2 | The Matrix Reloaded | $29,758,417 | 481 | $53,880,216 | May 23 | - |
| 3 | Johnny English | $7,424,428 | 461 | $31,936,155 | Apr 11 | - |
| 4 | How to Lose a Guy in 10 Days | $4,627,491 | 361 | $11,243,705 | Apr 18 | - |
| 5 | Phone Booth | $4,281,884 | 273 | $10,975,277 | Apr 18 | - |
| 6 | Kangaroo Jack | $3,379,532 | 382 | $5,356,026 | May 16 | - |
| 7 | Old School | $3,315,399 | 316 | $3,698,173 | May 9 | - |
| 8 | The Jungle Book 2 2003 Re-release | $2,884,513 | 481 | $13,569,802 | Apr 11 | - |
| 9 | Darkness Falls | $2,539,336 | 295 | $2,787,927 | May 9 | - |
| 10 | Hope Springs | $1,567,189 | 303 | $1,567,189 | May 9 | - |
| 11 | Dreamcatcher | $1,123,788 | 344 | $2,807,999 | Apr 25 | - |
| 12 | Welcome to Collinwood | $1,055,912 | 288 | $2,612,267 | Apr 25 | - |
| 13 | I Capture the Castle | $937,333 | 77 | $1,205,206 | May 9 | - |
| 14 | Secretary | $797,243 | 60 | $1,385,941 | May 16 | - |
| 15 | The Hot Chick | $551,862 | 218 | $663,156 | May 23 | - |
| 16 | S Club Seeing Double | $447,225 | 399 | $3,476,861 | Apr 11 | - |
| 17 | 25th Hour | $442,304 | 114 | $940,502 | Apr 25 | - |
| 18 | Bulletproof Monk | $403,984 | 322 | $3,219,040 | Apr 18 | - |
| 19 | The Actors | $367,742 | 270 | $367,742 | May 16 | - |
| 20 | Armaan | $349,181 | 27 | $349,181 | May 16 | - |
| 21 | Andaaz | $299,862 | 32 | $381,619 | May 23 | - |
| 22 | The Leopard | $179,986 | 5 | $179,986 | May 2 | - |
| 23 | The Truth About Charlie | $109,929 | - | $109,929 | May 16 | - |
| 24 | Antwone Fisher | $97,222 | 46 | $97,222 | May 16 | - |
| 25 | To Kill a King | $96,766 | 53 | $96,766 | May 16 | - |
| 26 | The Recruit | $87,207 | 382 | $7,083,794 | Mar 21 | - |
| 27 | The Heart of Me | $84,134 | 41 | $84,134 | May 2 | - |
| 28 | Half Past Dead | $73,297 | 73 | $73,297 | May 2 | - |
| 29 | The Little Polar Bear 2003 Re-release | $56,730 | 235 | $1,167,736 | Apr 11 | - |
