Cathy Dennis (born Catherine Roseanne Dennis, March 25, 1969, Norwich, England) is a Grammy Award-winning dance-oriented pop singer-songwriter, record producer and actress. She was first spotted recording Stevie Wonder-influenced demos at The Kitchen in Norwich with her father (himself an experienced musician and local restaurateur) on piano.

In 2006 Dennis was listed in the N.M.E top 100 most influential people in music. Dennis is also reported to be one of the richest women in the UK.

She has recently collaborated with the British singer Sophie Ellis-Bextor, and songwriter Greg Kurstin, on a track called "Catch You", the first track Ellis-Bextor hadn't been involved with the writing of since her days in theaudience. It peaked at #8 on the UK Singles Chart.

As of 2007, it was confirmed that Dennis had been working with Róisín Murphy on her second solo album, "Overpowered". She co-wrote the songs "Sunshine", "Off & On" and "Don't Let It Go to Your Head Boy". She has also co-written a track for Kylie Minogue's tenth studio album and worked with Daniel Merriweather.

She is in the studio with Dr. Luke working with singer Letoya Luckett on her forthcoming second album.