Katherine Jane "Katy" Harris (previously Nelson) is a fictional character from the British ITV soap opera Coronation Street, portrayed by Lucy-Jo Hudson. She made her first on-screen appearance on 13 November 2002, before departing in 2005. The teenage daughter of the Harris family, Katy's storylines centred on her family's victimisation by a gang, her diabetic diagnosis and her relationship with Martin Platt (Sean Wilson).