Siân Davis was born in Archway, North London. She went to school in North Finchley before living in Australia and Laos from the ages of 18 - 20.
She trained at The Royal Acadamy of Dramatic Art (RADA) and The National Youth Theatre. She is known for Doc Marten, Truelove (ITV) Casuelty, Eastenders (BBC) and Black Mirror (Netflix).