Television:
* The Crown (2016-2020): As Camilla Shand (later Duchess of Cornwall) in seasons 2, 3, and 4.
* The Last Post (2017): As Lady Sarah Farquhar
* Vanity Fair (2018): As Mrs. Bute Crawley
* The English Game (2020): As Lady Margaret
* Sanditon (2020-present): As Lady Susan Parker
* The Pale Horse (2020): As Thyrza Grey
* The Pursuit of Love (2021): As Fanny Logan
Films:
* Iris (2001): As young Iris Murdoch
* The Importance of Being Earnest (2002): As Gwendolen Fairfax
* The Lost Prince (2003): As Queen Mary
* Bright Young Things (2003): As Nina
* The Duchess (2008): As Georgiana's sister, Lady Elizabeth Foster
* The King's Speech (2010): As Queen Mary
* Their Finest (2016): As Mary
* The Personal History of David Copperfield (2019): As Mrs. Gummidge
* Emma (2020): As Mrs. Bates
This list is not exhaustive, but it highlights some of Finty Williams' most prominent work in film and television. She is known for her talent and versatility, often playing complex and nuanced characters.