Rebecca Ryan (born 27 April 1991) is an English actress, best known for her role as Debbie Gallagher in the Channel 4 comedy-drama series Shameless (2004–2009). Ryan also appeared as Vicki MacDonald in the BBC One school-based drama series Waterloo Road (2009–2011), Gemma Dean in the BBC One medical drama Casualty (2017–2019) and from 2021 to 2022, she appeared in the ITV soap opera Coronation Street as Lydia Chambers.