by Contents
Movie
| Year | Movie | Role |
| 2007 | I Could Never Be Your Woman | Izzie Mensforth |
| 2007 | The Christmas Miracle of Jonathan Toomey | Celia Hardwick |
| 2007 | Atonement | Briony Tallis (aged 13) |
| 2007 | Death Defying Acts | Benji McGarvie |
| 2008 | City of Ember | Lina Mayfleet |
| 2009 | The Lovely Bones | Susie Salmon |
| 2010 | Arrietty | Arrietty |
| 2010 | The Way Back | Irena Zielińska |
| 2011 | Hanna | Hanna |
| 2011 | Violet & Daisy | Daisy |
| 2012 | Byzantium | Eleanor Webb |
| 2013 | The Host | Melanie Stryder / Wanderer “Wanda” |
| 2013 | How I Live Now | Daisy |
| 2013 | Justin and the Knights of Valour | Talia |
| 2014 | The Grand Budapest Hotel | Agatha |
| 2014 | Muppets Most Wanted | Ballet Dancer |
| 2014 | Lost River | Rat |
| 2015 | Stockholm, Pennsylvania | Leia Dargon |
| 2015 | Weepah Way for Now | Emily / Narrator |
| 2015 | Brooklyn | Éilis Lacey |
| 2017 | Loving Vincent | Marguerite Gachet |
| 2017 | Lady Bird | Christine “Lady Bird” McPherson |
| 2017 | On Chesil Beach | Florence Ponting |
| 2018 | The Seagull | Nina Zarechnaya |
| 2018 | Mary Queen of Scots | Mary, Queen of Scots |
| 2019 | Little Women | Josephine “Jo” March |
| 2020 | Ammonite | Charlotte Murchison |
| TBA | The French Dispatch | TBA |
| TBA | Untitled Tom George film | Constable Stalker |
TV Show
| Year | TV Show | Role |
| 2003–2004 | The Clinic | Rhiannon Geraghty |
|---|---|---|
| 2005 | Proof | Orla Boland |
| 2014 | Robot Chicken | Various |
| 2017 | Saturday Night Live | Herself (host) |
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