Marion Craig Wentworth (1872–1942) was an American playwright, poet, and suffragist. She is best known for her feminist anti-war play, War Brides, which was made into a silent film starring Alla Nazimova in 1916.

Marion Eleanor Zimmer Bradley was an American author of fantasy, historical fantasy, science fiction, and science fantasy novels, and is best known for the Arthurian fiction novel The Mists of Avalon and the Darkover series. Noted for the feminist perspective in her writing, her reputation has been posthumously marred by her daughter Moira Greyland's accusations of child sexual abuse, and for allegedly assisting her second husband, convicted child abuser Walter Breen, in sexually abusing multiple unrelated children.

Marjorie Benton Cooke was an American monologist, playwright, and novelist. A specialist in comic dramatic sketches and light romantic fiction, she also wrote and performed monologues on suffragist issues.

Margaret Gabrielle Vere Long, who used the pseudonyms Marjorie Bowen and Joseph Shearing, was a British author who wrote historical romances, supernatural horror stories, popular history and biography.

Mark Akenside was an English poet and physician.

Mark Antony Lower F.S.A. M.A. was a Sussex historian and schoolteacher who founded the Sussex Archaeological Society. An anti-Catholic propagandist, Lower is believed to have started the "cult of the Sussex Martyrs", although he was against the excesses of the "Bonfire Boys".

Mark Clifton (1906–1963) was an American science fiction writer, the co-winner of the second Hugo Award for best novel. He began publishing in May 1952 with the widely anthologized story "What Have I Done?".

Mark Guy Pearse was a Cornish Methodist preacher, lecturer and author who, during the last quarter of the 19th century and the first of the 20th, was a household name throughout Britain and beyond. Born at Camborne, Cornwall, from childhood he "drank in the traditions of Methodism", as his daughter put it.

Mark Lemon was the founding editor of both Punch and The Field. He was also a writer of plays and verses.

Samuel Langhorne Clemens, best known by his pen name Mark Twain, was an American writer, humorist, entrepreneur, publisher, and lecturer. He was praised as the "greatest humorist the United States has produced", and William Faulkner called him "the father of American literature". His novels include The Adventures of Tom Sawyer (1876) and its sequel, Adventures of Huckleberry Finn (1884), the latter of which has often been called the "Great American Novel". Twain also wrote A Connecticut Yankee in King Arthur's Court (1889) and Pudd'nhead Wilson (1894), and co-wrote The Gilded Age: A Tale of Today (1873) with Charles Dudley Warner.