Kate Phillips (born 21 May 1989) is a British actress. She came to prominence for her role as Jane Seymour in the successful miniseries Wolf Hall (2015). She then appeared in the miniseries War and Peace (2016), the first season of the television series The Crown (2016), and the final three seasons of the television series Peaky Blinders (2016–2022).

In 2019 she appeared as Princess Mary in the film Downton Abbey. Since 2020 she has played the role of Eliza Scarlet, the lead character in the Victorian crime drama Miss Scarlet and the Duke.