
Biography
Siân Thomas – British actress of Welsh heritage, born 20 September 1953 in Stratford-upon-Avon, Warwickshire, England. Trained at the Central School of Speech and Drama, sister of actress Sara Mair-Thomas, and long-time partner of the poet Tony Harrison (died 2025). A distinguished stage actress with credits at the Royal Shakespeare Company, National Theatre, and West End, including an Olivier Award nomination for Up for Grabs (2002) and an Off West End Award nomination for The Cherry Orchard (2017). Her most notable film roles include Thorhild the Sarcastic in Erik the Viking (1989), Lady Darlington in Vanity Fair (2004), Madame Gaillard in Perfume: The Story of a Murderer (2006), Amelia Bones in Harry Potter and the Order of the Phoenix (2007), Edith May in War Machine (2017), and Lilly in Finding Your Feet (2018). On television she has appeared in Wide-Eyed and Legless (1993), The Worst Week of My Life (2005), The Ruby in the Smoke (2006), Midsomer Murders (2006), Merlin (2009), Atlantis (2013), New Tricks (2014), Doc Martin (2019), and Under Milk Wood (2014). She is also known for her poetry readings on BBC Radio 3 and audiobook work.
Acted in 47
2020s
- 2025
22+1
Nurse
2010s
- 2019
Widow's Walk
additional voice
- 2018
- 2017
- 2016
Shooting Clerks
Jason's Lady Friend
- 2014
Under Milk Wood
Mrs. Dai Bread Two
- 2013
- 2011
The Royal Bodyguard
Muriel Whittington · 1 episode
2000s
- 2009
Grandpa in My Pocket
Lenora · 1 episode
- 2008
- 2007
Half Broken Things
Shelley
Dangerous Liaisons
Annie
- 2006
The Ruby in the Smoke
Mrs Rees
- 2005
Vincent
Helen Miller · 1 episode
- 2004
- 2003
Coming Up
Abbess · 1 episode
The Last Detective
Annie · 1 episode
1990s
- 1999
- 1998
- 1997
- 1995
A Mind to Murder
Dr. Saxon
- 1994
Othello
Desdemona (voice)
Rose Red
Clare Marvel
- 1993
Wide-Eyed and Legless
Aileen Armitage
Doctor Finlay
Stella Powell · 1 episode
Celia
Miss Nelly · 6 episodes
- 1992
- 1991
Stanley and the Women
Lindsey Lucas · 4 episodes
- 1990
Frankenstein's Baby
Judith Cole
No Job for a Lady
Mrs. Johnson · 1 episode
1980s
- 1989
Victoria Wood
Girl on Farm · 1 episode
Shadow of the Noose
Hettie Chattell · 1 episode
- 1987
- 1984
- 1983
- 1982
Nancy Astor
Ettie Grenfell · 1 episode
Costume and makeup 1
2010s
- 2016
ID2: Shadwell Army
Costume Design