Matthew Phipps Shiell, known as M. P. Shiel, was a British writer. His legal surname remained "Shiell" though he adopted the shorter version as a de facto pen name.

Montague Rhodes James was an English author, medievalist scholar and provost of King's College, Cambridge (1905–1918), and of Eton College (1918–1936). He was Vice-Chancellor of the University of Cambridge (1913–15).

Maarten Maartens, pen name of Jozua Marius Willem van der Poorten Schwartz, was a Dutch writer, who wrote in English. He was quite well known at the end of the nineteenth and the beginning of the twentieth century, in both the UK and the US, but he was soon forgotten after his death.

Mabel Collins was a British theosophist and author of over 46 books.

Mabel Osgood Wright was an American writer. She was an early leader in the Audubon movement who wrote extensively about nature and birds.

Mabel Potter Daggett was an American writer, journalist, editor and suffragist. Daggett reported from France during World War I, wrote a biography of Queen Marie of Romania, and was active in the woman's movement in the US.

Maciej Kazimierz Sarbiewski, was Europe's most prominent Latin poet of the 17th century, and a renowned theoretician of poetics.

Dallas McCord "Mack" Reynolds was an American science fiction writer. His pen names included Dallas Ross, Mark Mallory, Clark Collins, Dallas Rose, Guy McCord, Maxine Reynolds, Bob Belmont, and Todd Harding. His work focused on socioeconomic speculation, usually expressed in thought-provoking explorations of utopian societies from a radical, sometime satiric perspective. He was a popular author from the 1950s to the 1970s, especially with readers of science fiction and fantasy magazines.

Marie-Madeleine Pioche de La Vergne, Comtesse de La Fayette, better known as Madame de La Fayette, was a French writer; she authored La Princesse de Clèves, France's first historical novel and one of the earliest novels in literature.

Claire Élisabeth Jeanne Gravier de Vergennes de Rémusat was a French woman of letters. She married at sixteen, and was attached to the Empress Josephine as dame du palais in 1802.