Mary Wilhelmine Williams specialized in Latin American history. She was on the board of editors of the Hispanic American Historical Review from 1927 to 1933 and was secretary of the Conference on Latin American History in 1928 and 1934.

Mary Wollstonecraft was a British writer, philosopher, and advocate of women's rights. Until the late 20th century, Wollstonecraft's life, which encompassed several unconventional personal relationships at the time, received more attention than her writing. Today Wollstonecraft is regarded as one of the founding feminist philosophers, and feminists often cite both her life and her works as important influences.

Mateo Alemán y del Nero (Seville, September 1547 – Mexico City, 1614) was a Spanish novelist and writer.

Mathilde Blind, was a German-born English poet, fiction writer, biographer, essayist and critic. In the early 1870s she emerged as a pioneering female aesthete in a mostly male community of artists and writers. By the late 1880s she had become prominent among New Woman writers such as Vernon Lee, Amy Levy, Mona Caird, Olive Schreiner, Rosamund Marriott Watson, and Katharine Tynan. She was praised by Algernon Charles Swinburne, William Michael Rossetti, Amy Levy, Edith Nesbit, Arthur Symons and Arnold Bennett. Her much-discussed poem The Ascent of Man presents a distinctly feminist response to the Darwinian theory of evolution.

Matilda Coxe Stevenson, who also wrote under the name Tilly E. Stevenson, was an American ethnologist, geologist, explorer, and activist. She was a supporter of women in science, helping to establish the Women's Anthropological Society in Washington DC. Stevenson was also the first woman hired by the Bureau of American Ethnology (BAE) to research southwestern Indigenous people. In doing so, she published multiple monographs and one long text on the Zuni people. Her work was supported by some of her male colleagues at the time and was seen as a contemporary by some of her fellow ethnologists or anthropologists. However, she faced barriers as a woman scientist in the nineteenth and early twentieth centuries; in order to compete, she defied societal expectation which pushed some to regard her as stubborn and aggressive.

Matilda Joslyn Gage was an American writer and activist. She is mainly known for her contributions to women's suffrage in the United States but she also campaigned for Native American rights, abolitionism, and freethought. She is the eponym for the Matilda effect, which describes the tendency to deny women credit for scientific invention. She influenced her son-in-law L. Frank Baum, the author of The Wonderful Wizard of Oz.

Matilde Serao was an Italian journalist and novelist. She was the first woman called to edit an Italian newspaper, Il Corriere di Roma and later Il Giorno. Serao was also the co-founder and editor of the newspaper Il Mattino, and the author of several novels. She never won the Nobel Prize in Literature despite being nominated on six occasions.

Matteo Maria Boiardo was an Italian Renaissance poet, best known for his epic poem Orlando innamorato.

Matthew Arnold was an English poet and cultural critic who worked as an inspector of schools. He was the son of Thomas Arnold, the celebrated headmaster of Rugby School, and brother to both Tom Arnold, literary professor, and William Delafield Arnold, novelist and colonial administrator. Matthew Arnold has been characterised as a sage writer, a type of writer who chastises and instructs the reader on contemporary social issues. He was also an inspector of schools for thirty-five years, and supported the concept of state-regulated secondary education.

Maud Diver was an English author in British India who wrote novels, short stories, biographies and journalistic pieces primarily on Indian topics and Englishmen in India.