Stuart Colin Matthewman (born 18 August 1960), also known as Cottonbelly, is an English songwriter, record producer and musician.

Joining Latin funk band Pride, Matthewman met singer Sade Adu and they began writing songs together.

[7] Matthewman co-wrote, performed, and produced tracks on Santessa's 2000 trip-hop album, Delirium, released on Sony.

[9] In an interview with Pete Lewis for Blues and Soul print magazine, issue 1098, Paloma Faith discusses working with songwriters: "another person I really clicked with was Stuart Matthewman, who is Sade's co-writer.

He went on to compose the music scores for various films;[13] with Maxwell the music for the short film To Be A Black Man (1997),[14] and Twin Falls Idaho (1999),[15] Jackpot (2001), Northfork (2003), The Double (2005),[16] The Astronaut Farmer (2006), Life Support (2007), The Smell of Success (2009), Nona (2017)[17] and short Erotic Dreams of the Chelsea Hotel (2017).

[18] Matthewman has discussed diverse musical influences[19] including Junior Walker, King Curtis, Art Pepper, Ernie Isley, Steve Jones, Wah Wah Watson, Issac Hayes, Bill Withers, Lee Perry, Tony Iommi and Gustav Mahler.