Marian Green (born 1944) is a British author who has been working in the fields of magic, witchcraft and the Western Mysteries since the early 1960s.
She founded and continued to organise the Quest Conference held every year in the UK and has edited the magazine Quest since founding it in 1970.
She created the Green Circle, a network of magicians and pagans in 1982.
She was previously a council member of the Pagan Federation and the editor of Pagan Dawn.
Green runs residential and non-residential weekends and correspondence courses through the Invisible College, which she founded.
She is the author of over 20 books. Her manuals are widely used in the witchcraft community.