Etta Marcus (born 26 January 2001) is an English singer-songwriter from London, England.

Marcus was born in Brixton, South London. She began playing the piano at the age of 8 and moved on to guitar when she was 10. Marcus began studying jazz at Trinity Laban Conservatoire of Music and Dance in her native London, but was kicked out during her first year. She then decided to dedicate her full attention to her own music.