Actor
| 1. | The I Inside (2004) as Peter Cable | |
| 2. | A Painted House (2003) as Jesse Chandler | |
| 3. | Driven (2001) | |
| 4. | Tape (2001) as Jon Salter | |
| 5. | Chelsea Walls (2001) as Terry | |
| 6. | The Last Days of Disco (1998) | |
| 7. | Ground Control (1998) as Cruise | |
| 8. | I Love You, I Love You Not (1997) as Young Nazi Officer | |
| 9. | Killer: A Journal Of Murder (1996) as Henry Lesser | |
| 10. | Much Ado About Nothing (1993) as Count Claudio of Florence | |
| 11. | Swing Kids (1993) as Peter Muller | |
| 12. | The Age of Innocence (1993) | |
| 13. | Married To It (1991) as Chuck Bishop | |
| 14. | Mr. & Mrs. Bridge (1990) as Douglas Bridge (grown-up) | |
| 15. | Dead Poets Society (1989) | |
| 16. | The Manhattan Project (1986) as Max (Ithaca) |
Most Popular Films with Robert Sean Leonard
| 1. | A Painted House | 2003 |
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| 2. | The Last Days of Disco | 1998 |
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| 3. | Dead Poets Society | 1989 |
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| 4. | The Manhattan Project | 1986 |
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| 5. | Chelsea Walls | 2001 |
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| 6. | I Love You, I Love You Not | 1997 |
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| 7. | Driven | 2001 |
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| 8. | Ground Control | 1998 |
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| 9. | Swing Kids | 1993 |
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| 10. | Killer: A Journal Of Murder | 1996 |
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