Edith Mary Oldham Ellis (née Lees; 9 March 1861 – 14 September 1916) was an English writer and women's rights activist.

She was the only child of Samuel Oldham Lees, a landowner, and his wife Mary Laetitia, née Bancroft.

She was born prematurely after her mother sustained a head injury during pregnancy and she died when Ellis was an infant.

She was educated at a convent school in 1873 until her father realised that she was taking a strong interest in the Catholic faith.

From the beginning, their marriage was unconventional; she was openly lesbian[citation needed] and at the end of the honeymoon Ellis went back to his bachelor rooms.