Sean Astin has been credited as
Actor 25
| Man & Witch | Pre-Production | TBA |
| Checkmate ... Dyson | Completed | TBA |
| Kickback | Pre-Production | TBA |
| The Witches of Oz ... Frack | Completed | TBA |
| Elvis Has Left the Building | Completed | TBA |
| Adverse | 2021 | |
| Ploey ... (voice) | 2019 | |
| Gloria Bell | 2019 | |
| The Lears | 2019 | |
| Unleashed | 2017 | |
| Bad Kids of Crestview Academy | 2017 | |
| The Do-Over | 2016 | |
| Woodlawn ... Hank | 2015 | |
| Do You Believe? ... Dr. Farell | 2015 | |
| Cabin Fever: Patient Zero | 2014 | |
| Moms' Night Out ... Sean | 2014 | |
| Stay Cool | 2011 | |
| Forever Strong | 2008 | |
| The Final Season | 2007 | |
| Click | 2006 | |
| Smile | 2005 | |
| Bigger Than the Sky | 2005 | |
| 50 First Dates | 2004 | |
| The Lord of the Rings: The Return of the King | 2003 | |
| The Lord of the Rings: The Two Towers | 2002 |
Limited credits available; non-exhaustive filmography.
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