Mary Bosanquet Fletcher (12 September 1739 – 8 December 1815) was a Methodist preacher, credited with persuading John Wesley, one of the founders of Methodism, to allow women to preach in public.
She, along with her friend and fellow preacher Sarah Crosby, would become the most popular female preachers of their time.
Bosanquet was known as a "Mother in Israel", a Methodist term of honour, for her work in spreading the denomination across England.
She was also involved in charity work throughout her life.