Sian Northey was brought up in Trawsfynydd, and now lives in Penrhyndeudraeth in North West Wales.
After numerous jobs, including periods in Tŷ Newydd Writing Centre and Gwasg y Bwthyn, she decided to work as a freelance author, poet and editor.
Her first poetry collection,Trwy Ddyddiau Gwydr (Through Glass Days, Gwasg Carreg Gwalch), was shortlisted for the 2013 Wales Book of the Year Award. Spanish translations of eight of her poems will be included in an anthology published in Mexico. She has also published numerous fiction for children.
Her first adult novel, Yn y Tŷ Hwn (In This House, Gomer), was published in 2011, and was chosen for the 2011 Exchange Bookcase. Rhyd y Gro (Gomer, 2016) is her second novel for adults, and was also chosen for the 2016 Exchange Bookcase.
She is currently studying part time for a PhD in Creative Writing at the School of Welsh at Bangor University, and was selected to the Writers at Work programme at the 2016 Hay Festival.