Allan Arthur Guy Sigsworth is an English record producer and songwriter. During his career, he has worked with many artists, including Seal, Björk, Goldie, Madonna, Britney Spears, Kate Havnevik, Imogen Heap, Bebel Gilberto, Mozez, David Sylvian, Alanis Morissette, Eric Whitacre, Alison Moyet, and AURORA. He has also collaborated with many celebrated instrumental musicians, including Talvin Singh, Jon Hassell, and Lester Bowie. He is a member of the duo Frou Frou, with Imogen Heap.

Frou Frou are a British electronic duo composed of musician Imogen Heap and producer/songwriter Guy Sigsworth. They released their only album, Details, in 2002. The duo wrote, produced, and played instruments on the tracks, while Heap also provided lead vocals. In 2004, they recorded a cover of "Holding Out for a Hero" by Bonnie Tyler, which was used in the credits of the 2004 film Shrek 2. Frou Frou amicably disbanded later that year.