| Rank | LW | Release
| Gross | %± LW | Theaters | Change | Average | Total Gross | Weeks | Distributor
| New This Week
| Estimated
|
|---|
| 1 | - | Death Happen | $272,484 | - | 78 | - | $3,493 | $272,484 | 1 | Mongkol Film Company | true | false |
| 2 | 1 | Harry Potter and the Half-Blood Prince | $250,628 | -61.6% | 134 | -58 | $1,870 | $3,851,659 | 3 | Warner Bros. | false | false |
| 3 | 2 | Nee Dtaam Galileo | $193,773 | -50.1% | 81 | -41 | $2,392 | $714,778 | 2 | N/A | false | false |
| 4 | - | The Taking of Pelham 123 | $149,071 | - | 35 | - | $4,259 | $182,223 | 1 | Sony Pictures Releasing | true | false |
| 5 | 3 | Public Enemies | $72,271 | -55% | 63 | -20 | $1,147 | $291,725 | 2 | United International Pictures | false | false |
| 6 | - | The Hangover | $39,844 | - | 17 | - | $2,343 | $39,844 | 1 | Warner Bros. | true | false |
| 7 | - | Brüno | $19,128 | - | 4 | - | $4,782 | $19,128 | 1 | Mongkol Major | true | false |
| 8 | 5 | Transformers: Revenge of the Fallen | $12,517 | -41.5% | 29 | -11 | $431 | $5,904,186 | 6 | United International Pictures | false | false |
| 9 | 4 | Wongkamlao | $9,532 | -69.6% | 24 | -21 | $397 | $2,647,033 | 5 | Mongkol Film Company | false | false |
| 10 | - | Echelon Conspiracy | $4,599 | - | 2 | - | $2,299 | $4,599 | 1 | N/A | true | false |
| 11 | 6 | Ice Age: Dawn of the Dinosaurs | $4,261 | -70.6% | 6 | -5 | $710 | $1,114,035 | 5 | 20th Century Fox International | false | false |
| 12 | - | Public Enemy | $1,252 | - | 1 | - | $1,252 | $1,252 | 1 | M Pictures | true | false |
| 13 | 13 | 17 Again | $1,070 | +210.1% | 1 | -1 | $1,070 | $156,314 | 8 | Warner Bros. | false | false |
| 14 | - | Book of Blood | $1,006 | - | 1 | - | $1,006 | $1,006 | 1 | M Pictures | true | false |
| 15 | 9 | Chéri | $806 | -37.9% | 1 | - | $806 | $10,421 | 4 | N/A | false | false |
| 16 | 8 | Departures | $775 | -48.3% | 2 | +1 | $387 | $26,323 | 7 | Mongkol Major | false | false |
| 17 | 7 | District 13: Ultimatum | $678 | -58.4% | 2 | -4 | $339 | $74,800 | 4 | M Pictures | false | false |
| 18 | 10 | April Bride | $447 | -48.2% | 1 | - | $447 | $1,688 | 2 | N/A | false | false |
