Kate Marie Nash (born 6 July 1987) is an English singer, songwriter and musician. She had a UK number-2 hit "Foundations" in 2007, followed by the platinum-selling UK number-1 album Made of Bricks. She was named Best Female Artist at the 2008 BRIT Awards.

Her second studio album, entitled My Best Friend Is You, was released in the United Kingdom on 19 April 2010 and in the U.S. on 11 May 2010. It spawned her second biggest chart hit to date, the single "Do-Wah-Doo".

Nash is currently signed to The Island Def Jam Motown Ireland Group.

Nash was born on 6 July 1987 in Harrow, London to an English father, Steven Nash, and an Irish mother, Marie (née Walsh). Marie is a nurse in a hospice. Nash learned to play the piano while at at Sandbach School. She was raised as a Roman Catholic and attended St. John Fisher School, Pinner, before moving onto the St Joan of Arc Catholic School, Rickmansworth. She was also taught guitar by Saskia van Berkel and studied Theatre at the BRIT School for Performing Arts and Technology in South London. She auditioned at the Bristol Old Vic Theatre School, but was rejected. Soon afterward, she fell down a flight of stairs, breaking her foot. During her recovery, she was housebound and unable to move, so her mother bought her an electric guitar. Nash used this time to focus on her songwriting: she began to write some new songs, finish old ones and decided that she would book a gig at a local bar ("Trinity") in Harrow to showcase her songs.

Nash started her career in 2005. After several gigs, she uploaded her music to MySpace, found a manager and then producers for her music.

Nash's debut was a single, "Caroline's a Victim"/"Birds", produced and recorded in Iceland by Valgeir Sigurðsson and released through Moshi Moshi Records in February 2007. The release was limited to 1,000 copies and available only on 7" vinyl. Due to demand, another 1,000 copies were made and these also sold out. CD-promo copies were produced for distribution to the press and DJs and are occasionally available for sale. The single is featured on the CD Moshi Moshi Singles Compilation. A video for the song, directed by Kinga Burza, was released and received airplay on MTV2. The single's B-side, "Birds", later featured on her début album Made of Bricks. Both tracks have also been released as MP3 downloads.