| Rank | LW | Release
| Gross | %± LW | Theaters | Change | Average | Total Gross | Weeks | Distributor
| New This Week
| Estimated
|
|---|
| 1 | - | Rahtree Revenge | $300,720 | - | 93 | - | $3,233 | $300,720 | 1 | Mongkol Film Company | true | false |
| 2 | 1 | G.I. Joe: The Rise of Cobra | $181,555 | -56.3% | 104 | -39 | $1,745 | $2,154,753 | 3 | United International Pictures | false | false |
| 3 | - | Inglourious Basterds | $115,455 | - | 59 | - | $1,956 | $115,455 | 1 | United International Pictures | true | false |
| 4 | 2 | Raging Phoenix | $95,803 | -63.1% | 84 | -41 | $1,140 | $616,277 | 2 | Mongkol Film Company | false | false |
| 5 | 3 | In Country Melody 2 | $54,672 | -58.4% | 57 | -22 | $959 | $350,020 | 2 | Pranakorn Films | false | false |
| 6 | - | Orphan | $54,351 | - | 37 | - | $1,468 | $81,314 | 1 | Warner Bros. | true | false |
| 7 | - | Coco Before Chanel | $18,948 | - | 4 | - | $4,737 | $18,948 | 1 | N/A | true | false |
| 8 | 4 | Harry Potter and the Half-Blood Prince | $9,163 | -65.3% | 13 | -22 | $704 | $4,055,856 | 6 | Warner Bros. | false | false |
| 9 | 6 | Trail of the Panda 2009 Re-release | $7,851 | -57.4% | 19 | +8 | $413 | $84,820 | 2 | Walt Disney Pictures | false | false |
| 10 | 9 | The Hangover | $6,241 | -55% | 4 | -1 | $1,560 | $114,842 | 4 | Warner Bros. | false | false |
| 11 | 5 | The Taking of Pelham 123 | $3,217 | -85.7% | 6 | -25 | $536 | $345,002 | 4 | Sony Pictures Releasing | false | false |
| 12 | 7 | Nee Dtaam Galileo | $2,781 | -83.7% | 9 | -13 | $309 | $879,423 | 5 | N/A | false | false |
| 13 | 12 | Brüno | $2,654 | -69.6% | 4 | +1 | $663 | $60,201 | 4 | Mongkol Major | false | false |
| 14 | 14 | Transformers: Revenge of the Fallen | $1,147 | -46.3% | 1 | -3 | $1,147 | $5,916,777 | 9 | United International Pictures | false | false |
| 15 | 11 | Sam Chuk | $1,057 | -89.1% | 10 | -33 | $105 | $76,153 | 3 | N/A | false | false |
| 16 | 13 | Public Enemies | $991 | -70.8% | 3 | -1 | $330 | $332,476 | 5 | United International Pictures | false | false |
| 17 | 10 | Death Happen | $441 | -95.8% | 5 | -30 | $88 | $470,103 | 4 | Mongkol Film Company | false | false |
| 18 | 19 | Departures | $373 | -43% | 1 | - | $373 | $28,978 | 10 | Mongkol Major | false | false |
| 19 | 16 | The Wedding Game | $361 | -58.6% | 1 | - | $361 | $1,674 | 2 | Mongkol Major | false | false |
| 20 | 17 | Echelon Conspiracy | $340 | -55.6% | 2 | - | $170 | $9,590 | 4 | N/A | false | false |
| 21 | 18 | Baby and I | $226 | -68.1% | 1 | - | $226 | $1,468 | 2 | M Pictures | false | false |
| 22 | 21 | April Bride | $68 | -69.6% | 1 | - | $68 | $2,811 | 5 | N/A | false | false |
| 23 | 20 | Public Enemy | $59 | -85.1% | 1 | - | $59 | $3,242 | 4 | M Pictures | false | false |
