Manon Steffan Ros was born in Rhiwlas, Snowdonia. After leaving school, she worked as an actress for a few years before becoming a writer.
She has won the drama prize at the Eisteddfod twice, has been shortlisted for Wales Book of the Year twice, has won the Tir Na N'Og prize for Welsh children's literature three times, and won the prose medal at the 2018 Eisteddfod for her novel, Llyfr Glas Nebo. Her play, Mwgsi, won a National Theatre Wales award in 2018. She lives in Tywyn, Meirionnydd with her sons.