Sian Thomas
- 22+1
2025 Nurse
- Widow's Walk
2019 additional voice
- The Conductor
2018 Mother Frank
- War Machine
2017 Edith May
- Finding Your Feet
2017 Lilly Glover
- Shooting Clerks
2016 Jason's Lady Friend
- ID2: Shadwell Army
2016 Costume Design
- Under Milk Wood
2014 Mrs. Dai Bread Two
- Atlantis
2013 Eurydice
- The Royal Bodyguard
2011 Muriel Whittington
- Grandpa in My Pocket
2009 Lenora
- Merlin
2008 Atorloppe
- Harry Potter and the Order of the Phoenix
2007 Amelia Bones
- Dangerous Liaisons
2007 Annie
- Half Broken Things
2007 Shelley
- Lewis
2007 Ingrid Nielson
- Perfume: The Story of a Murderer
2006 Madame Gaillard
- The Ruby in the Smoke
2006 Mrs Rees
- Vincent
2005 Helen Miller
- Vanity Fair
2004 Lady Darlington
- The Worst Week of My Life
2004 Nicola
- New Tricks
2004 Monica Dryden
- Doc Martin
2004 Paula Kemp
- Sredni Vashtar
2003 The Aunt
- The Last Detective
2003 Annie
- Coming Up
2003 Abbess
- Holby City
1999 Zoe Martin
- Vanity Fair
1998 Lady Steyne
- Midsomer Murders
1997 Peggy Aynscombe
- Blind Men
1997 Julie McAnearney
- A Mind to Murder
1995 Dr. Saxon
- Tears Before Bedtime
1995 Susan
- Rose Red
1994 Clare Marvel
- Othello
1994 Desdemona (voice)
- Wide-Eyed and Legless
1993 Aileen Armitage
- Celia
1993 Miss Nelly
- Doctor Finlay
1993 Stella Powell
- Shakespeare: The Animated Tales
1992 Desdemona (voice)
- Performance
1991 Queen Isabel
- Stanley and the Women
1991 Lindsey Lucas
- Frankenstein's Baby
1990 Judith Cole
- No Job for a Lady
1990 Mrs. Johnson
- Erik the Viking
1989 Thorhild the Sarcastic
- Victoria Wood
1989 Girl on Farm
- Shadow of the Noose
1989 Hettie Chattell
- Screen One
1989 Judith Cole
- Prick Up Your Ears
1987 Marilyn Orton
- Inspector Morse
1987 Carol Sharp
- The Bill
1984 Sally Paresh
- Taggart
1983 Martine Evans
- Jury
1983 Jennifer Patterson
- Nobody's Hero
1982 Cara
- Nancy Astor
1982 Ettie Grenfell
- Maybury
1981 Lesley
- Killers
1976 Sarah Lusk
