Kacey Louise Barnfield (born 14 January 1988 in London, England) is an English teenage actress who is well known for her portrayal as bully Maddie Gilks in the long running BBC children's series Grange Hill.

Kacey's first notable TV role was a guest role in the BBC drama Hope and Glory that starred Lenny Henry.

In 2001, Kacey won the role of bully Maddie Gilks in Grange Hill, where she found herself the central role in certain plots during her five-year stint on the show.

During series 29th, Kacey left the show in the seventh episode - with Maddie having dropped out of the Lower Sixth.

Kacey has recently filmed Popcorn with Jodi Albert and Jack Ryder, and plays the character of Yukino. She has also appeared in the Sky One football drama Dream Team.