Cathy Dennis (born Catherine Roseanne Dennis, 25th March 1969, Norwich, United Kingdom) is a Grammy award-winning dance-oriented pop singer-songwriter, record producer and actress. After a moderately successful international solo career, Dennis has latterly achieved great success as a writer of pop songs, scoring seven UK number 1s and winning five Ivor Novello Awards.

As a teenager she was spotted recording Stevie Wonder-influenced demos at The Kitchen in Norwich with her father (himself an experienced musician and local restaurateur) on piano. At the time she was working for Norwich Union. Simon Fuller signed her to his 19 Management company (with whom she is still signed) and to label Polydor at aged 17, and this began a career-long association with the impressario that has seen Dennis provide songs for many Fuller-related artists and projects.