| Rank | Release
| Genre
| Budget
| Running Time
| Gross | Theaters | Total Gross | Release Date | Distributor
| Estimated
|
|---|
| 1 | G.I. Joe: The Rise of Cobra | - | - | - | $2,198,499 | 217 | $2,380,237 | Aug 6 | United International Pictures | false |
| 2 | My Ex | - | - | - | $710,513 | 115 | $1,415,217 | Aug 27 | RS Film & Distribution | false |
| 3 | Raging Phoenix | - | - | - | $484,695 | 125 | $678,912 | Aug 12 | Mongkol Film Company | false |
| 4 | Death Happen | - | - | - | $470,103 | 78 | $470,103 | Jul 30 | Mongkol Film Company | false |
| 5 | Harry Potter and the Half-Blood Prince | - | - | - | $465,653 | 338 | $4,154,286 | Jul 16 | Warner Bros. | false |
| 6 | Rahtree Revenge | - | - | - | $461,059 | 93 | $518,044 | Aug 20 | Mongkol Film Company | false |
| 7 | Nee Dtaam Galileo | - | - | - | $359,920 | 122 | $880,925 | Jul 23 | - | false |
| 8 | The Taking of Pelham 123 | - | - | - | $314,779 | 35 | $347,931 | Jul 30 | Sony Pictures Releasing | false |
| 9 | In Country Melody 2 | - | - | - | $256,451 | 79 | $383,830 | Aug 12 | Pranakorn Films | false |
| 10 | Inglourious Basterds | - | - | - | $228,312 | 59 | $311,150 | Aug 20 | United International Pictures | false |
| 11 | Orphan | - | - | - | $132,204 | 37 | $158,321 | Aug 20 | Warner Bros. | false |
| 12 | The Hangover | - | - | - | $122,513 | 17 | $126,912 | Jul 30 | Warner Bros. | false |
| 13 | Public Enemies | - | - | - | $114,564 | 83 | $334,018 | Jul 23 | United International Pictures | false |
| 14 | Sam Chuk | - | - | - | $72,721 | 56 | $79,817 | Aug 5 | - | false |
| 15 | Brüno | - | - | - | $63,518 | 4 | $66,223 | Jul 30 | Mongkol Major | false |
| 16 | Coco Before Chanel | - | - | - | $39,176 | 7 | $66,159 | Aug 20 | - | false |
| 17 | Trail of the Panda 2009 Re-release | - | - | - | $36,858 | 21 | $93,021 | Aug 12 | Walt Disney Pictures | false |
| 18 | Transformers: Revenge of the Fallen | - | - | - | $26,618 | 376 | $6,034,198 | Jun 23 | United International Pictures | false |
| 19 | Bandslam | - | - | - | $22,510 | 23 | $36,655 | Aug 27 | Mongkol Major | false |
| 20 | Solstice | - | - | - | $14,099 | 19 | $14,099 | Aug 6 | Mongkol Major | false |
| 21 | Echelon Conspiracy | - | - | - | $13,731 | 5 | $18,308 | Jul 30 | - | false |
| 22 | Wongkamlao | - | - | - | $13,526 | 131 | $2,651,027 | Jul 1 | Mongkol Film Company | false |
| 23 | Ponyo | - | - | - | $7,969 | 2 | $27,906 | Aug 27 | M Pictures | false |
| 24 | Ice Age: Dawn of the Dinosaurs | - | - | - | $7,598 | 88 | $1,117,372 | Jul 1 | 20th Century Fox International | false |
| 25 | Departures | - | - | - | $4,079 | 2 | $30,324 | Jun 18 | Mongkol Major | false |
| 26 | Public Enemy | - | - | - | $3,242 | 1 | $3,242 | Jul 30 | M Pictures | false |
| 27 | April Bride | - | - | - | $1,570 | 1 | $2,811 | Jul 23 | - | false |
| 28 | The Wedding Game | - | - | - | $1,491 | 1 | $1,674 | Aug 12 | Mongkol Major | false |
| 29 | Chéri | - | - | - | $1,289 | 1 | $10,904 | Jul 9 | - | false |
| 30 | Baby and I | - | - | - | $1,206 | 1 | $1,468 | Aug 12 | M Pictures | false |
| 31 | 17 Again | - | - | - | $1,070 | 13 | $156,314 | Jun 11 | Warner Bros. | false |
| 32 | Book of Blood | - | - | - | $1,006 | 1 | $1,006 | Jul 30 | M Pictures | false |
| 33 | Killshot | - | - | - | $838 | 1 | $838 | Aug 6 | M Pictures | false |
| 34 | District 13: Ultimatum | - | - | - | $678 | 13 | $74,800 | Jul 9 | M Pictures | false |
