Allison Janney has been credited as
Actor 35
| Bad Education | Post-Production | TBA |
| The Heart | Pre-Production | TBA |
| A Happening of Monumental Proportions | Completed | TBA |
| A Book of Common Prayer | Pre-Production | TBA |
| Lazy Susan | 2020 | |
| Breaking News In Yuba County | 2020 | |
| The Addams Family ... Margaux Needler (voice) | 2019 | |
| Ma | 2019 | |
| Troop Zero | 2019 | |
| Sun Dogs | 2018 | |
| I, Tonya ... LaVona Harding | 2017 | |
| Miss Peregrine's Home for Peculiar Children ... Dr. Golan | 2016 | |
| Tallulah | 2016 | |
| Minions | 2015 | |
| Spy | 2015 | |
| The DUFF | 2015 | |
| Tammy | 2014 | |
| Bad Words | 2014 | |
| Mr. Peabody & Sherman ... Mrs. Grunion (voice) | 2014 | |
| Brightest Star ... The Astronomer | 2014 | |
| Lucky Them | 2014 | |
| The Way, Way Back | 2013 | |
| Struck By Lightning | 2013 | |
| The Oranges | 2012 | |
| Finding Nemo 3D ... Peach (voice) | 2012 | |
| Liberal Arts ... English professor | 2012 | |
| A Thousand Words | 2012 | |
| The Help | 2011 | |
| Life During Wartime | 2010 | |
| Away We Go | 2009 | |
| Juno | 2007 | |
| Winter Solstice | 2005 | |
| The Chumscrubber | 2005 | |
| How to Deal | 2003 | |
| Strangers With Candy | DISC |
Limited credits available; non-exhaustive filmography.
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