Amelia Beers Warnock Garvin, who wrote under the pen name Katherine Hale, was a Canadian poet, critic, and short story writer.

Katherine Anne MacLean was an American science fiction author best known for her short fiction of the 1950s which examined the impact of technological advances on individuals and society.

Kathleen Mansfield Murry was a New Zealand writer and critic, widely considered one of the most influential and important authors of the modernist movement. Her works are celebrated across the world, and have been published in 25 languages.

Katrina Trask, also known as Kate Nichols Trask, was an American author and philanthropist.

Kay Boyle was an American novelist, short story writer, educator, and political activist. She was a Guggenheim Fellow and O. Henry Award winner.

John Keith Laumer was an American science fiction author. Prior to becoming a full-time writer, he was an officer in the United States Air Force and a diplomat in the United States Foreign Service. His older brother March Laumer was also a writer, known for his adult reinterpretations of the Land of Oz. Frank Laumer, their youngest brother, is a historian and writer.

Kenneth Grahame was a Scottish writer born in Edinburgh, Scotland. He is most famous for The Wind in the Willows (1908), a classic of children's literature, as well as The Reluctant Dragon. Both books were later adapted for stage and film, of which A. A. Milne's Toad of Toad Hall, based on part of The Wind in the Willows, was the first. Other adaptations include Cosgrove Hall Films' The Wind in the Willows, and the Walt Disney films.

Kenneth Hotham Vickers was an English historian and university administrator. From 1922–1946 he was Principal of Southampton University College which became the University of Southampton in 1952.

Kersey Graves was a skeptic, atheist, rationalist, spiritualist, reformist writer, who was popular on the American freethought circuit of the late 19th century.

Kirk Munroe was an American writer and conservationist.