Filmography62 titles
| Year | Title | Character | Age at release |
|---|---|---|---|
| 2026 | Secret ServiceSeries | Rose Trewen | 63 |
| 2024 | Douglas Is CancelledSeries | Sheila | 61 |
| 2022 | The ReadSeries | Narrator | 59 |
| 2022 | The Chelsea DetectiveSeries | US Ambassador Emily Morgan | 59 |
| 2022 | Dodger Special: TrainMovie | Lucifer | 59 |
| 2022 | DodgerSeries | Lucifer | 59 |
| 2022 | The FallMovie | Dr. Greta Portius | 59 |
| 2018 | A Discovery of WitchesSeries | Sarah Bishop | 55 |
| 2016 | Gilmore Girls: A Year in the LifeSeries | Naomi Shropshire | 53 |
| 2016 | Happily Ever AfterMovie | Ria | 53 |
| 2016 | Shoot the MessengerSeries | Mary Foster | 53 |
| 2014 | Penn Zero: Part-Time HeroSeries | Vlurgen (voice) | 51 |
| 2014 | Doctor Who: The Ultimate CompanionMovie | River Song (archive footage) | 51 |
| 2013 | Doctor Who Live: The Next DoctorMovie | River Song (archive footage) | 50 |
| 2013 | Doctor Who Live: The AfterpartyMovie | Self | 50 |
| 2013 | Ghost PhoneMovie | Sheila | 50 |
| 2012 | ArrowSeries | Dinah Lance | 49 |
| 2012 | The Science of Doctor WhoMovie | River Song (archive footage) | 49 |
| 2012 | The Timey-Wimey of Doctor WhoMovie | River Song (archive footage) | 49 |
| 2011 | MarchlandsSeries | Helen Maynard | 48 |
| 2010 | Blue BloodsSeries | Commander Sloane Thompson | 47 |
| 2010 | Ben HurSeries | Ruth | 47 |
| 2009 | FlashForwardSeries | Fiona Banks | 46 |
| 2008 | Lost in AustenSeries | Mrs Bennet | 45 |
| 2007 | Private PracticeSeries | Dr. Marla Thomkins | 44 |
| 2007 | The Graham Norton ShowSeries | Self | 44 |
| 2007 | CrashingMovie | Diane Freed | 44 |
| 2006 | Alpha DogMovie | Tiffany Hartunian | 43 |
| 2005 | Doctor WhoSeries | River Song | 42 |
| 2005 | The Poseidon AdventureMovie | Suzanne Harrison | 42 |
| 2004 | Who Do You Think You Are?Series | Self | 41 |
| 2004 | Strictly Come DancingSeries | Self - Contestant | 41 |
| 2003 | NCISSeries | Miranda Pennebaker | 40 |
| 2003 | BoudicaMovie | Boudica | 40 |
| 2002 | Without a TraceSeries | Lucy Costin | 39 |
| 2002 | NBC 75th Anniversary SpecialMovie | Self | 39 |
| 2002 | V Graham NortonSeries | Self | 39 |
| 2000 | CSI: Crime Scene InvestigationSeries | Patricia Alwick | 37 |
| 2000 | Essex BoysMovie | Lisa Locke | 37 |
| 1999 | Law & Order: Special Victims UnitSeries | Miranda Pond | 36 |
| 1999 | Loose WomenSeries | Self | 36 |
| 1999 | This Space Between UsMovie | Peternelle | 36 |
| 1998 | CroupierMovie | Jani De Villiers | 35 |
| 1997 | The ViewSeries | Self | 34 |
| 1996 | The Fortunes and Misfortunes of Moll FlandersMovie | Moll Flanders | 33 |
| 1996 | Saint-ExMovie | Chic Party Guest | 33 |
| 1995 | The InfiltratorMovie | Anna | 32 |
| 1995 | CarringtonMovie | Frances Partridge | 32 |
| 1994 | The KnockSeries | Katherine Roberts | 31 |
| 1994 | ERSeries | Elizabeth Corday | 31 |
| 1994 | Crocodile ShoesSeries | Caroline Carrison | 31 |
| 1994 | Woman of the WolfMovie | The Woman | 31 |
| 1993 | Late Show with David LettermanSeries | Self - Guest | 30 |
| 1993 | Late Night with Conan O'BrienSeries | Self - Guest | 30 |
| 1991 | Soldier SoldierSeries | Ursula Kröhling | 28 |
| 1989 | The Cook, the Thief, His Wife & Her LoverMovie | Adele | 26 |
| 1988 | HannaySeries | — | 25 |
| 1988 | The Play on OneSeries | Daniella | 25 |
| 1986 | Henry's LegSeries | Noreen | 23 |
| 1984 | The BillSeries | — | 21 |
| 1980 | The Wildcats of St Trinian'sMovie | Schoolgirl (Uncredited) | 17 |
| 1978 | Grange HillSeries | Jill Harcourt | 15 |