| Name | Image | Role | Notes |
|---|---|---|---|
| Brie Larson |  |
Ma | Awards:   |
| Jacob Tremblay |  |
Jack | |
| Sean Bridgers | Old Nick | ||
| Wendy Crewson | Talk Show Hostess | ||
| Sandy McMaster | Veteran | ||
| Matt Gordon | Doug | ||
| Amanda Brugel | Officer Parker | ||
| Joe Pingue | Officer Grabowski | ||
| Joan Allen | Nancy | ||
| Zarrin Darnell-Martin | Attending Doctor | ||
| Cas Anvar | Dr. Mittal | ||
| William H. Macy | Robert | ||
| Jee-Yun Lee | News Anchor | ||
| Randal Edwards | Lawyer | ||
| Justin Mader | FBI Agent | ||
| Ola Sturik | Reporter #1 | ||
| Rodrigo Fernandez-Stoll | Reporter #2 | ||
| Rory O'Shea | Reporter #3 | ||
| Tom McCamus | Leo | ||
| Kate Drummond | Neighbor | ||
| Jack Fulton | Jack's Friend | ||
| Chantelle Chung | Clerk (uncredited) | ||
| Derek Herd | Diner Patron (uncredited) | ||
| Megan Park | Laura (uncredited) | ||
| Brad Wietersen | TV Crewman (uncredited) |
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73
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Room (2015 film)
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