| Honorific-Prefix: | The Right Honourable |
| The Baroness Thomas of Winchester | |
| Office: | Member of the House of Lords Lord Temporal |
| Term Start: | 15 June 2006 Life Peerage |
| Birth Date: | 14 October 1945 |
| Party: | Liberal Democrats |
Celia Marjorie Thomas, Baroness Thomas of Winchester, (born 14 October 1945 in Winchester, Hants) was a founding member of the Liberal Party in Winchester in the 1960s.
Thomas was appointed a Member of the Order of the British Empire (MBE) in the 1985 Birthday Honours.
On 26 May 2006, she was created a life peer with the title Baroness Thomas of Winchester, of Winchester in the County of Hampshire, and she sits as a Liberal Democrat.
Thomas is a Trustee of the charity Muscular Dystrophy UK, having been a long term sufferer.[1] She is also Patron of Driving Mobility, the national charity that provides specialist driving and mobility assessment centres.