by Contents
Movie
| Year | Movie | Role |
| 1994 | Heavenly Creatures | Juliet Hulme |
| 1995 | Sense and Sensibility | Marianne Dashwood |
| 1995 | A Kid in King Arthur’s Court | Princess Sarah |
| 1996 | Jude | Sue Bridehead |
| 1996 | Hamlet | Ophelia |
| 1997 | Titanic | Rose DeWitt Bukater |
| 1998 | Hideous Kinky | Julia |
| 1999 | Faeries | Brigid (voice) |
| 1999 | Holy Smoke! | Ruth Barron |
| 2000 | Quills | Madeleine |
| 2001 | Enigma | Hester Wallace |
| 2001 | Iris | Young Iris Murdoch |
| 2001 | War Game | Annie (voice) |
| 2001 | Christmas Carol: The Movie | Belle (voice) |
| 2003 | The Life of David Gale | Bitsey Bloom |
| 2004 | Eternal Sunshine of the Spotless Mind | Clementine Kruczynski |
| 2004 | Finding Neverland | Sylvia Llewelyn Davies |
| 2005 | Romance & Cigarettes | Tula |
| 2006 | Deep Sea 3D | Narrator |
| 2006 | All the King’s Men | Anne Stanton |
| 2006 | Little Children | Sarah Pierce |
| 2006 | Flushed Away | Rita (voice) |
| 2006 | The Holiday | Iris |
| 2007 | The Fox and the Child | Narrator |
| 2008 | The Reader | Hanna Schmitz |
| 2008 | Revolutionary Road | April Wheeler |
| 2009 | A Mother’s Courage: Talking Back to Autism | Narrator |
| 2011 | Carnage | Nancy Cowan |
| 2011 | Contagion | Erin Mears |
| 2013 | Movie 43 | Beth |
| 2013 | Labor Day | Adele Wheeler |
| 2014 | Divergent | Jeanine Matthews |
| 2014 | A Little Chaos | Sabine De Barra |
| 2015 | The Divergent Series: Insurgent | Jeanine Matthews |
| 2015 | Daisy Chain | Buttercup (voice) |
| 2015 | Steve Jobs | Joanna Hoffman |
| 2015 | The Dressmaker | Myrtle “Tilly” Dunnage |
| 2016 | Triple 9 | Irina Vlaslov |
| 2016 | Collateral Beauty | Claire Wilson |
| 2016 | The Lost Letter | Narrator |
| 2017 | The Mountain Between Us | Alex Martin |
| 2017 | Wonder Wheel | Ginny |
| 2018 | Mary and the Witch’s Flower | Madame Mumblechook (voice) |
| 2019 | Birds of a Feather | Blanche (voice) |
| 2019 | Blackbird | Jennifer |
| 2020 | Ammonite | Mary Anning |
| 2020 | Black Beauty… | Black Beauty (voice) |
| 2022 | Avatar 2 … | Ronal |
TV Show
| Year | TV Show | Role |
| 1991 | Dark Season | Reet |
| 1992 | Anglo-Saxon Attitudes | Caroline Jenington |
| 1992–93 | Get Back | Eleanor Sweet |
| 1993 | Casualty | Suzanne |
| 2004 | Pride | Suki (voice) |
| 2004 | Saturday Night Live | Host |
| 2005 | Extras | Herself |
| 2011 | Mildred Pierce | Mildred Pierce |
| 2015 | Running Wild with Bear Grylls | Herself |
| 2015 | Snow Chick | Narrator |
| 2017 | Diana: The Day Britain Cried | Narrator |
| 2017 | Snow Bears | Narrator |
| 2019 | Moominvalley | Mrs Fillyjonk (voice) |
| TBA | Mare of Easttown | Mare Sheehan |
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