| Black Doves | 2024 | Actress | Helen Webb |
| The Sound Collector | 2023 | Actress | The Narrator |
| Boston Strangler | 2023 | Actress | Loretta McLaughlin |
| Silent Night | 2021 | Actress | Nell |
| Charlotte | 2021 | Actress | Charlotte Salomon (voice) |
| Misbehaviour | 2020 | Actress | Sally Alexander |
| The Aftermath | 2019 | Actress | Rachael Morgan |
| Berlin, I Love You | 2019 | Actress | Jane |
| Official Secrets | 2019 | Actress | Katharine Gun |
| The Nutcracker and the Four Realms | 2018 | Actress | Sugar Plum |
| Colette | 2018 | Actress | Colette |
| Pirates of the Caribbean: Dead Men Tell No Tales | 2017 | Actress | Elizabeth Swann |
| Red Nose Day Actually | 2017 | Actress | Juliet |
| Collateral Beauty | 2016 | Actress | Amy |
| Everest | 2015 | Actress | Jan Hall |
| The Imitation Game | 2014 | Actress | Joan Clarke |
| Laggies | 2014 | Actress | Megan |
| Jack Ryan: Shadow Recruit | 2014 | Actress | Cathy Muller |
| Begin Again | 2013 | Actress | Gretta |
| Once Upon a Time... | 2013 | Actress | Gabrielle Chanel |
| Anna Karenina | 2012 | Actress | Anna Karenina |
| Seeking a Friend for the End of the World | 2012 | Actress | Penny |
| Neverland | 2011 | Actress | Tinker Bell (voice) |
| A Dangerous Method | 2011 | Actress | Sabina Spielrein |
| London Boulevard | 2010 | Actress | Charlotte |
| Steve | 2010 | Actress | Woman |
| Last Night | 2010 | Actress | Joanna |
| Never Let Me Go | 2010 | Actress | Ruth |
| The Continuing and Lamentable Saga of the Suicide Brothers | 2009 | Actress | The Fairy |
| The Duchess | 2008 | Actress | Georgiana |
| The Edge of Love | 2008 | Actress | Vera Phillips |
| Robbie the Reindeer in Close Encounters of the Herd Kind | 2007 | Actress | Em (voice) |
| Silk | 2007 | Actress | Hélène Joncour |
| Atonement | 2007 | Actress | Cecilia Tallis |
| Pirates of the Caribbean: At World's End | 2007 | Actress | Elizabeth Swann |
| Pirates of the Caribbean: Dead Man's Chest | 2006 | Actress | Elizabeth Swann |
| Domino | 2005 | Actress | Domino Harvey |
| Pride & Prejudice | 2005 | Actress | Elizabeth Bennet |
| The Jacket | 2005 | Actress | Jackie Price |
| King Arthur | 2004 | Actress | Guinevere |
| Love Actually | 2003 | Actress | Juliet |
| Pirates of the Caribbean | 2003 | Actress | Narrator (voice) |
| Pirates of the Caribbean: The Curse of the Black Pearl | 2003 | Actress | Elizabeth Swann |
| Gaijin | 2003 | Actress | Kate (voice) |
| The Seasons Alter | 2002 | Actress | Helena |
| Doctor Zhivago | 2002 | Actress | Lara Antipova |
| New Year's Eve | 2002 | Actress | Leah |
| Pure | 2002 | Actress | Louise |
| Thunderpants | 2002 | Actress | Music School Student (uncredited) |
| Bend It Like Beckham | 2002 | Actress | Jules |
| Deflation | 2001 | Actress | Jogger |
| The Hole | 2001 | Actress | Frankie |
| Princess of Thieves | 2001 | Actress | Gwyn |
| Oliver Twist | 1999 | Actress | Rose Fleming |
| Star Wars: Episode I - The Phantom Menace | 1999 | Actress | Sabé (as Kiera Knightley) |
| Coming Home | 1998 | Actress | Young Judith |
| The Treasure Seekers | 1996 | Actress | The Princess |
| Innocent Lies | 1995 | Actress | Young Celia |
| A Village Affair | 1995 | Actress | Natasha Jordan |
| The Bill | 1995 | Actress | Sheena Rose |
| Screen One | 1993 | Actress | Angela |
| Black Doves | 2024 | Producer | executive producer |
| Charlotte | 2021 | Producer | executive producer |
| Deflation | 2001 | Camera and Electrical Department | grip |
| Greed | 2019 | Thanks | special thanks to |
| Thunderpants | 2002 | Thanks | very special thanks |
| Begin Again | 2013 | Soundtrack | performer: "Step You Can't Take Back", "Lost Stars" (Keira Version), "Tell Me If You Wanna Go Home", "Coming Up Roses", "Like A Fool", "Tell Me If You Wanna Go Home (Rooftop Mix)" (uncredited) |
| The Edge of Love | 2008 | Soundtrack | performer: "Blue Tahitian Moon", "Maybe It's Because I Love You Too Much", "Drifting and Dreaming" |
| Pirates of the Caribbean: At World's End | 2007 | Soundtrack | performer: "Hoist the Colours" |
| Pirates of the Caribbean: The Curse of the Black Pearl | 2003 | Soundtrack | performer: "Yo Ho (A Pirate's Life for Me)" |
| Bend It Like Beckham | 2002 | Soundtrack | performer: "Hot Hot Hot" (1983) |
| A Village Affair | 1995 | Soundtrack | performer: "She'll Be Coming 'Round the Mountain" (uncredited) |
| Entertainment Tonight | 2006–2025 | Self | Self |
| 82nd Golden Globe Awards | 2025 | Self | Self - Nominee |
| Live with Kelly and Mark | 2007–2024 | Self | Self - Guest |
| ABC News Nightline | 2024 | Self | Self |
| Today | 2014–2024 | Self | Self - Guest |
| The Tonight Show Starring Jimmy Fallon | 2019–2024 | Self | Self - Guest |
| The Graham Norton Show | 2014–2024 | Self | Self - Guest |
| Harper's Bazaar UK TV Series | 2023 | Self | Self |
| Extra | 2008–2023 | Self | Self |
| The Drew Barrymore Show | 2023 | Self | Self - Guest |
| My Grandparents' War | 2022 | Self | Self |
| Made in Hollywood | 2012–2021 | Self | Self |
| Hollywood Insider | 2020–2021 | Self | Self |
| 2020: The Movie | 2021 | Self | Keira Knightley |
| Official Secrets: Cast and Crew Interviews Video | 2020 | Self | Self |
| Good Morning America | 2014–2020 | Self | Self - Guest |
| Good Morning Britain | 2019–2020 | Self | Self |
| Días de cine | 2019 | Self | Self - Interviewee |
| Celebrity Page | 2018–2019 | Self | Self |
| Deadline Studio | 2018 | Self | Self |
| Access Hollywood | 2018 | Self | Self |
| The Late Late Show with James Corden | 2018 | Self | Self - Guest |
| The Ellen DeGeneres Show | 2006–2018 | Self | Self - Guest |
| Late Night with Seth Meyers | 2014–2018 | Self | Self - Guest |
| The Late Show with Stephen Colbert | 2018 | Self | Self - Guest |
| THR Studio at Park City TV Mini Series | 2018 | Self | Self |
| Variety Studio | 2014–2018 | Self | Self |
| The Red Nose Day Special | 2017 | Self | Self |
| A Modern Fable: Discovering Collateral Beauty | 2017 | Self | Self |
| IMDb Asks | 2015 | Self | Self |
| The Oscars | 2015 | Self | Self - Nominee |
| Til topps i Hollywood TV Movie | 2015 | Self | Self - Skuespiller |
| ScreenSlam | 2015 | Self | Self |
| Jimmy Kimmel Live! | 2014–2015 | Self | Self - Guest |
| The EE British Academy Film Awards | 2015 | Self | Self - Nominee |
| E! Live from the Red Carpet | 2006–2015 | Self | Self |
| The 21st Annual Screen Actors Guild Awards | 2015 | Self | Self - Nominee & Presenter |
| Dagsrevyen | 2015 | Self | Self - Interviewee (segment "The Imitation Game") |
| 20th Annual Critics' Choice Movie Awards | 2015 | Self | Self |
| 72nd Golden Globe Awards | 2015 | Self | Self - Nominee |
| W Magazine TV Series | 2015 | Self | Self |
| Variety Studio: Actors on Actors | 2014 | Self | Self |
| CBS Mornings | 2014 | Self | Self - Guest |
| Hollywood Film Awards | 2014 | Self | Self |
| Janela Indiscreta | 2014 | Self | Self |
| DP/30: Conversations About Movies | 2012–2014 | Self | Self |
| Wimbledon | 2014 | Self | Self - Spectator (uncredited) |
| The Insider | 2014 | Self | Self |
| E! News | 2014 | Self | Self |
| The View | 2003–2014 | Self | Self - Guest |
| The Daily Show | 2005–2014 | Self | Self - Guest |
| Sir Kenneth Branagh: The Tsar of Shadow Recruit Video | 2014 | Self | Self |
| Jack Ryan: The Smartest Guy in the Room | 2014 | Self | Self |
| Coco Mademoiselle: Chanel | 2014 | Self | Self |
| The 2013 European Film Awards TV Special | 2013 | Self | Self - Nominee |
| SAG Foundation Conversations | 2013 | Self | Self |
| Celebrity Style Story | 2013 | Self | Self |
| Keira Knightley: Becoming Anna | 2013 | Self | Self |
| Creating the Stunning Costumes of Anna Karenina Video | 2013 | Self | Self |
| Creating the Extraordinary World of Anna Karenina Video | 2013 | Self | Self |
| Anna Karenina: A Story of Epic Love | 2013 | Self | Self |
| Tavis Smiley | 2012 | Self | Self - Guest |
| Late Night with Jimmy Fallon | 2011–2012 | Self | Self - Guest |
| Charlie Rose | 2008–2012 | Self | Self - Guest |
| The Tonight Show with Jay Leno | 2003–2012 | Self | Self - Guest |
| ES.TV HD | 2012 | Self | Self - Guest |
| Entertainers with Byron Allen | 2012 | Self | Self - Guest |
| Up Close with Carrie Keagan | 2012 | Self | Self - Guest |
| Soccer Aid | 2012 | Self | Self |
| The Jonathan Ross Show | 2012 | Self | Self - Guest |
| Republic of Telly | 2011 | Self | Self |
| 55th BFI London Film Festival | 2011 | Self | Self |
| Biennale Channel TV Series | 2011 | Self | Self |
| Coco Mademoiselle | 2011 | Self | Self |
| Cinema 3 | 2011 | Self | Self - Interviewee |
| Comic Relief: Red Nose Day 2011 | 2011 | Self | Self |
| Breakfast | 2011 | Self | Self - Guest |
| The Role That Changed My Life | 2011 | Self | Self |
| BFI London Film Festival Awards | 2010 | Self | Self |
| The People Speak UK | 2010 | Self | Self |
| Georgiana in Her Own Words Video | 2009 | Self | Self |
| How Far She Went: Making the Duchess Video | 2009 | Self | Self |
| Looking Over: The Edge of Love | 2008 | Self | Self |
| Shootout | 2005–2008 | Self | Self |
| Late Night with Conan O'Brien | 2005–2008 | Self | Self - Guest |
| Late Show with David Letterman | 2004–2008 | Self | Self - Guest |
| Xposé | 2008 | Self | Self |
| Bringing the Past to Life: The Making of 'Atonement' | 2008 | Self | Self |
| An Evening at the Academy Awards | 2008 | Self | Self |
| This Morning | 2004–2008 | Self | Self - Guest |
| The Orange British Academy Film Awards | 2008 | Self | Self - Nominee |
| Imagine | 2008 | Self | Self |
| Variety Club Showbiz Awards 2007 TV Special | 2007 | Self | Self - Winner |
| Bloopers of the Caribbean | 2007 | Self | Self |
| Friday Night with Jonathan Ross | 2007 | Self | Self - Guest |
| HypaSpace | 2007 | Self | Self |
| A Journey Behind the Scenes of 'Pirates of the Caribbean: At World's End' | 2007 | Self | Self |
| Inside Dead Man's Chest | 2006 | Self | Self |
| Pirates on Location: Cannibal Island & Tortuga Bar Brawl | 2006 | Self | Self |
| Creating the Kraken | 2006 | Self | Self |
| Meet Davy Jones: Anatomy of a Legend | 2006 | Self | Self |
| Mastering the Blade with Orlando, Keira and Jack | 2006 | Self | Self |
| According to Plan: The Making of 'Pirates of the Caribbean: Dead Man's Chest' | 2006 | Self | Self |
| Bloopers of the Caribbean | 2006 | Self | Self (uncredited) |
| American Masters | 2006 | Self | Self |
| THS Investigates | 2006 | Self | Self |
| Pirates of the Caribbean: Secrets of Dead Man's Chest | 2006 | Self | Self |
| The Oprah Winfrey Show | 2006 | Self | Self - Guest |
| The 78th Annual Academy Awards | 2006 | Self | Self - Nominee |
| The Stately Homes of Pride & Prejudice: Groombridge Place | 2006 | Self | Self |
| The Stately Homes of Pride & Prejudice: Basildon Park | 2006 | Self | Self |
| The Stately Homes of Pride & Prejudice: Wilton House | 2006 | Self | Self |
| The Stately Homes of Pride & Prejudice: Burghley House | 2006 | Self | Self |
| I Am a Bounty Hunter: Domino Harvey's Life | 2006 | Self | Self |
| Pride & Prejudice: The Life and Times of Jane Austen Video | 2006 | Self | Self |
| Pride & Prejudice: The Politics of 18th Century Dating | 2006 | Self | Self |
| Pride & Prejudice: On Set Diaries | 2006 | Self | Self |
| Pride & Prejudice: The Bennets | 2006 | Self | Self |
| The 63rd Annual Golden Globe Awards 2006 | 2006 | Self | Self - Nominee |
| Moët and Chandon Fashion Tribute: Matthew Williamson TV Special | 2005 | Self | Self |
| My Shot With TV Series | 2005 | Self | Self |
| The Philosopher's Zone Podcast Series | 2005 | Self | Self - Actress (voice) |
| The Reichen Show | 2005 | Self | Self - Guest |
| Isaac | 2005 | Self | Self |
| HBO First Look | 2005 | Self | Self |
| Magacine | 2005 | Self | Self |
| GMTV | 2005 | Self | Self |
| The Jacket: Project History and Deleted Scenes | 2005 | Self | Self |
| Comic Relief: Red Nose Night Live 05 | 2005 | Self | Self |
| King Arthur: A Roundtable Discussion | 2005 | Self | Self |
| Blood on the Land: The Making of a King | 2004 | Self | Self |
| Biography | 2004 | Self | Self |
| The Lost Disc: The Monkey's Name Is Jack | 2004 | Self | Self |
| The Making of 'King Arthur' | 2004 | Self | Self |
| 52 Most Irresistible Women | 2004 | Self | Self |
| Starz Special: On the Set of 'King Arthur' | 2004 | Self | Guinevere |
| She Shoots, She Scores: The Making of 'Bend It Like Beckham' | 2003 | Self | Self |
| An Epic at Sea: The Making of 'Pirates of the Caribbean: The Curse of the Black Pearl' | 2003 | Self | Self |
| Blooper Reel | 2003 | Self | Self (uncredited) |
| Tinseltown TV | 2003 | Self | Self |
| Cartaz Cultural | 2003 | Self | Self |
| The Saturday Show | 2002 | Self | Self - Guest |
| Entertainment Tonight | 2014–2025 | Archive Footage | Self |
| Icons of Football | 2024 | Archive Footage | Jules (archive footage) |
| Comedy Classic: The Vicar of Dibley TV Movie | 2022 | Archive Footage | Juliet (archive footage, uncredited) |
| Moments Within Moments | 2021 | Archive Footage | Self (archive footage) |
| The World According to Jeff Goldblum | 2020 | Archive Footage | Self (archive footage, uncredited) |
| Capital in the Twenty-First Century | 2019 | Archive Footage | Elizabeth Bennet (archive footage) |
| Louder with Crowder | 2018 | Archive Footage | Self (archive footage) |
| Good Morning Britain | 2018 | Archive Footage | Self (archive footage, uncredited) |
| Passé Sauvage TV Series | 2017 | Archive Footage | Self (archive footage) |
| Le fond de l'affaire Podcast Series | 2017 | Archive Footage | (archive footage) |
| Sunrise | 2017 | Archive Footage | Self (archive footage) |
| Ladies Moaning Loudly | 2016 | Archive Footage | #16 - A Dangerous Method (2011) (archive footage) |
| The Insider | 2014 | Archive Footage | Self (archive footage) |
| The Graham Norton Show | 2014 | Archive Footage | Self - Guest (archive footage) |
| Stars in Shorts | 2012 | Archive Footage | Woman (archive footage) |
| South at Six | 2012 | Archive Footage | Juliet (archive footage) |
| Celebrity Naked Ambition | 2011 | Archive Footage | Self (archive footage) |
| Farewell 'The Bill' TV Movie | 2010 | Archive Footage | Sheena Rose (archive footage, uncredited) |
| 20 to 1 | 2010 | Archive Footage | Self - Actress (archive footage) |
| taff | 2007–2010 | Archive Footage | Self (archive footage) |
| Raiders of the Lost Archive | 2009 | Archive Footage | Little Girl (archive footage) |
| Almost Famous II | 2009 | Archive Footage | (archive footage) |
| The Story of the Costume Drama | 2008 | Archive Footage | Lara Antipova (archive footage) |
| The 80th Annual Academy Awards | 2008 | Archive Footage | Cecilia Tallis (archive footage, uncredited) |
| Oscar, que empiece el espectáculo | 2008 | Archive Footage | Cecilia Tallis |
| Forbes 20 Under 25: Young, Rich and Famous | 2007 | Archive Footage | Self (archive footage) |
| Paris Hilton Inc.: The Selling of Celebrity | 2007 | Archive Footage | Self (archive footage) |
| Movie Connections | 2007 | Archive Footage | Jules Paxton (archive footage, uncredited) |
| Planet Voice | 2007 | Archive Footage | Elizabeth Swann (archive footage) |
| Cómo conseguir un papel en Hollywood | 2007 | Archive Footage | Self (archive footage) |
| Cosmetic Surgery Nightmares | 2006 | Archive Footage | Self (archive footage, uncredited) |
| World of Robin Hood | 2006 | Archive Footage | Gwyn (archive footage, uncredited) |
| Corazón de... | 2005–2006 | Archive Footage | Self (archive footage) |
| The Stately Homes of Pride & Prejudice: Chatsworth House | 2006 | Archive Footage | Self |
| Pride & Prejudice: Alternate US Ending | 2006 | Archive Footage | Elizabeth Bennet (archive footage, uncredited) |
| 101 Sexiest Celebrity Bodies | 2005 | Archive Footage | Self - Place #92 (archive footage) |
| Greatest Before They Were Stars TV Moments | 2005 | Archive Footage | Princess Beatrice (archive footage) |
| Pride and Prejudice Revisited | 2005 | Archive Footage | Elizabeth Bennet (archive footage, uncredited) |
| Stories of Lost Souls | 2005 | Archive Footage | Leah (segment "New Year's Eve") (archive footage) |