| Rank | Release
| Genre
| Budget
| Running Time
| Gross | Theaters | Total Gross | Release Date | Distributor
| Estimated
|
|---|
| 1 | Harry Potter and the Half-Blood Prince | - | - | - | $3,352,676 | 338 | $4,154,286 | Jul 16 | Warner Bros. | false |
| 2 | Wongkamlao | - | - | - | $2,379,563 | 131 | $2,651,027 | Jul 1 | Mongkol Film Company | false |
| 3 | Transformers: Revenge of the Fallen | - | - | - | $2,084,081 | 376 | $6,034,198 | Jun 23 | United International Pictures | false |
| 4 | Ice Age: Dawn of the Dinosaurs | - | - | - | $929,820 | 88 | $1,117,372 | Jul 1 | 20th Century Fox International | false |
| 5 | Nee Dtaam Galileo | - | - | - | $521,005 | 122 | $880,925 | Jul 23 | - | false |
| 6 | Public Enemies | - | - | - | $219,454 | 83 | $334,018 | Jul 23 | United International Pictures | false |
| 7 | Nymph | - | - | - | $162,848 | 46 | $174,835 | Jul 1 | - | false |
| 8 | The Secret of Moonacre | - | - | - | $83,469 | 33 | $83,469 | Jul 9 | Mongkol Major | false |
| 9 | District 13: Ultimatum | - | - | - | $74,122 | 13 | $74,800 | Jul 9 | M Pictures | false |
| 10 | Up | - | - | - | $53,817 | 108 | $1,499,887 | Jun 11 | Walt Disney Pictures | false |
| 11 | 17 Again | - | - | - | $14,503 | 13 | $156,314 | Jun 11 | Warner Bros. | false |
| 12 | Departures | - | - | - | $13,162 | 2 | $30,324 | Jun 18 | Mongkol Major | false |
| 13 | Chéri | - | - | - | $9,615 | 1 | $10,904 | Jul 9 | - | false |
| 14 | Public Enemy Returns 2009 Re-release | - | - | - | $4,565 | 1 | $4,565 | Jul 2 | M Pictures | false |
| 15 | Fireflies in the Garden | - | - | - | $4,431 | 2 | $10,466 | May 16 | Mongkol Major | false |
| 16 | The Heir Apparent: Largo Winch | - | - | - | $2,949 | 2 | $5,719 | Jun 25 | M Pictures | false |
| 17 | April Bride | - | - | - | $1,241 | 1 | $2,811 | Jul 23 | - | false |
| 18 | Home | - | - | - | $514 | 14 | $7,355 | Jun 4 | M Pictures | false |
