Katherine Ellis is a Dance music vocalist and songwriter from England. She is also a member of the group Bimbo Jones. As a solo artist, Ellis records under the aliases Katherine E., Ellis, Arrola, K. Ellls and her maiden name Katherine Woods (Ellis is her married name, and she is mother to two sons).

In addition to her solo work, Ellis is best known for working with an array of club, electronica, pop and house performers, mostly as the lead vocalist on their projects, including Roger Sanchez, Ruff Driverz, Raven Maize (aka Joey Negro), Soul Avengerz, Lee Coombs, Dylan Rhymes, J‑Reverse, Noir, Soul Flava, Freemasons, Herd & Fitz, Tom De Neef, Tom Stephan and Meat Katie. Apart from her music career, Ellis has also done television commercial work and touring backup/vocals for various acts in Europe and the United States.