British Box Office For April 2004
| Rank | Release | Gross | Theaters | Total Gross | Release Date | Distributor |
|---|---|---|---|---|---|---|
| 1 | Scooby-Doo 2: Monsters Unleashed | $25,253,874 | 492 | $30,200,200 | Apr 2 | Warner Bros. |
| 2 | The Cat in the Hat | $11,942,572 | 445 | $13,828,494 | Apr 2 | United International Pictures |
| 3 | 50 First Dates | $10,314,897 | 399 | $14,191,335 | Apr 9 | - |
| 4 | Shaun of the Dead | $9,937,587 | 369 | $8,199,596 | - | United International Pictures |
| 5 | Gothika | $9,058,027 | 308 | $9,623,405 | Apr 2 | - |
| 6 | Kill Bill: Vol. 2 | $6,809,429 | 411 | $16,871,657 | Apr 23 | Buena Vista International |
| 7 | Starsky & Hutch | $5,607,549 | 453 | $22,714,898 | Mar 12 | - |
| 8 | Dawn of the Dead | $4,782,139 | 344 | $9,878,774 | Mar 26 | - |
| 9 | Monster | $2,917,984 | 81 | $4,554,719 | Apr 2 | Metrodome Distribution |
| 10 | The Butterfly Effect | $2,736,927 | 277 | $3,868,369 | Apr 16 | - |
| 11 | The Girl Next Door | $2,578,824 | 325 | $3,076,553 | Apr 16 | - |
| 12 | The Rundown | $2,106,628 | 294 | $3,742,875 | - | - |
| 13 | Hidalgo | $1,593,425 | 293 | $1,756,048 | Apr 16 | - |
| 14 | Mona Lisa Smile | $1,252,989 | 414 | $8,165,671 | Mar 12 | - |
| 15 | Agent Cody Banks 2: Destination London | $1,048,390 | 245 | $1,865,270 | Mar 26 | - |
| 16 | Honey | $1,006,092 | 318 | $6,076,374 | Mar 12 | - |
| 17 | Taking Lives | $923,039 | 258 | $1,669,779 | Apr 23 | - |
| 18 | Along Came Polly | $603,856 | 385 | $15,030,232 | Feb 27 | - |
| 19 | The Station Agent | $594,069 | 59 | $903,919 | - | - |
| 20 | Win a Date with Tad Hamilton! | $526,228 | 244 | $952,500 | Apr 23 | - |
| 21 | Capturing the Friedmans | $435,442 | 25 | $435,442 | Apr 9 | - |
| 22 | 21 Grams | $425,636 | 129 | $4,470,545 | Mar 5 | - |
| 23 | The Lord of the Rings: The Return of the King | $237,739 | 502 | $106,643,712 | Dec 17 | - |
| 24 | The Blind Swordsman: Zatoichi Canadian Release | $235,934 | 47 | $1,317,197 | Mar 19 | - |
| 25 | Barbershop 2: Back in Business | $227,527 | 45 | $330,248 | Apr 16 | - |
| 26 | The Match | $175,141 | 25 | $175,141 | Apr 9 | - |
| 27 | Under the Tuscan Sun | $160,370 | 245 | $806,314 | - | - |
| 28 | Wondrous Oblivion | $155,251 | 54 | $319,738 | Apr 23 | - |
| 29 | Masti | $122,430 | 24 | $337,664 | - | - |
| 30 | Open Range | $114,629 | 283 | $1,957,727 | Mar 19 | - |
| 31 | Yeh Lamhe Judaai Ke | $80,228 | 18 | $80,228 | Apr 9 | - |
| 32 | The Haunted Mansion | $44,215 | 430 | $14,866,970 | Feb 13 | - |
| 33 | The Fog of War | $40,255 | 7 | $40,255 | Apr 2 | - |
| 34 | Monsieur N. 2004 Re-release | $5,809 | - | $5,809 | Apr 23 | - |
