Actor
| 1. | Boogeyman 2 (2008) | |
| 2. | The Quiet (2006) as Brian | |
| 3. | Kart Racer (2003) as Scott McKenna | |
| 4. | Ten Bucks (2003) as Himself / Simon Camden | |
| 5. | Little Secrets (2002) | |
| 6. | Richie Rich's Christmas Wish (1998) as Richie Rich | |
| 7. | Phenomenon (1996) as Al Pennamin | |
| 8. | Whisper of the Heart (1995) as Seiji Amasawa (Eng.) | |
| 9. | Look Who's Talking Now (1993) as Mikey Ubriacco |
Director
| 1. | Ten Bucks (2003) Director |
Producer
| 1. | Ten Bucks (2003) Producer |
Writer
| 1. | Ten Bucks (2003) Writer | |
| 2. | Runt () Writer |
Most Popular Films with David Gallagher
| 1. | Look Who's Talking Now | 1993 |
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| 2. | Kart Racer | 2003 |
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| 3. | Little Secrets | 2002 |
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| 4. | Whisper of the Heart | 1995 |
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| 5. | Ten Bucks | 2003 |
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| 6. | Richie Rich's Christmas Wish | 1998 |
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| 7. | The Quiet | 2006 |
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| 8. | Phenomenon | 1996 |
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| 9. | Boogeyman 2 | 2008 |
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| 10. | Runt |
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