| Rank | LW | Release
| Gross | %± LW | Theaters | Change | Average | Total Gross | Weeks | Distributor
| New This Week
| Estimated
|
|---|
| 1 | - | My Ex | $710,513 | - | 115 | - | $6,178 | $710,513 | 1 | RS Film & Distribution | true | false |
| 2 | 2 | G.I. Joe: The Rise of Cobra | $95,622 | -47.3% | 86 | -18 | $1,111 | $2,306,662 | 4 | United International Pictures | false | false |
| 3 | 1 | Rahtree Revenge | $78,615 | -73.9% | 61 | -32 | $1,288 | $461,059 | 2 | Mongkol Film Company | false | false |
| 4 | 3 | Inglourious Basterds | $70,209 | -39.2% | 52 | -7 | $1,350 | $228,312 | 2 | United International Pictures | false | false |
| 5 | 6 | Orphan | $30,908 | -43.1% | 35 | -2 | $883 | $134,902 | 2 | Warner Bros. | false | false |
| 6 | 4 | Raging Phoenix | $25,341 | -73.5% | 61 | -23 | $415 | $667,822 | 3 | Mongkol Film Company | false | false |
| 7 | - | Bandslam | $22,510 | - | 23 | - | $978 | $22,510 | 1 | Mongkol Major | true | false |
| 8 | 7 | Coco Before Chanel | $13,115 | -30.8% | 3 | -1 | $4,371 | $39,176 | 2 | N/A | false | false |
| 9 | 5 | In Country Melody 2 | $12,251 | -77.6% | 48 | -9 | $255 | $377,399 | 3 | Pranakorn Films | false | false |
| 10 | - | Ponyo | $7,969 | - | 2 | - | $3,984 | $7,969 | 1 | M Pictures | true | false |
| 11 | 8 | Harry Potter and the Half-Blood Prince | $6,717 | -26.7% | 8 | -5 | $839 | $4,066,684 | 7 | Warner Bros. | false | false |
| 12 | 10 | The Hangover | $4,626 | -25.9% | 4 | - | $1,156 | $122,513 | 5 | Warner Bros. | false | false |
| 13 | 20 | Echelon Conspiracy | $4,074 | +1,098.2% | 3 | +1 | $1,358 | $13,731 | 5 | N/A | false | false |
| 14 | 9 | Trail of the Panda 2009 Re-release | $3,515 | -55.2% | 21 | +2 | $167 | $90,539 | 3 | Walt Disney Pictures | false | false |
| 15 | 13 | Brüno | $2,217 | -16.5% | 3 | -1 | $739 | $63,518 | 5 | Mongkol Major | false | false |
| 16 | 11 | The Taking of Pelham 123 | $1,417 | -56% | 6 | - | $236 | $347,931 | 5 | Sony Pictures Releasing | false | false |
| 17 | 16 | Public Enemies | $868 | -12.4% | 2 | -1 | $434 | $334,018 | 6 | United International Pictures | false | false |
| 18 | 14 | Transformers: Revenge of the Fallen | $796 | -30.6% | 10 | +9 | $79 | $5,918,287 | 10 | United International Pictures | false | false |
| 19 | 12 | Nee Dtaam Galileo | $621 | -77.7% | 3 | -6 | $207 | $880,925 | 6 | N/A | false | false |
| 20 | 18 | Departures | $499 | +33.8% | 1 | - | $499 | $29,627 | 11 | Mongkol Major | false | false |
