Krste Petkov Misirkov was a philologist, journalist, historian and ethnographer from the region of Macedonia.

Krum Pavlov Kyulyavkov was a Bulgarian writer, poet, journalist and Communist Party official.

Krystal Sutherland is an Australian writer. She is best known for her first novel, Our Chemical Hearts, and her third novel, House of Hollow, which is listed on the New York Times Best Seller list. She currently lives in London.

Krystian Bala is a Polish murderer, self-published writer, and photographer.

Krystyna Krahelska "Danuta" was a Polish poet, ethnographer, member of the Home Army, and a participant in the Warsaw Uprising.

Krystyna Kuhn is a German writer, best known for her crime-thriller book series Das Tal Season (2010–2013) and Monday Club (2015–2016).

Krystyna Żywulska, actually Zofia (Sonia) Landau, was a Polish writer, columnist, songwriter and graphic designer of Jewish origin.

Krzysztof Boruń was a Polish physicist, journalist and science fiction writer. As an author of a number of essays, articles and novels, he was an important popularizer of science. By his contemporaries, Boruń was described as the "visionary of space travel"

Krzysztof Kamil Baczyński, was a Polish poet and Home Army soldier, one of the most well known of the Generation of Columbuses, the young generation of Polish poets, of whom several perished in the Warsaw Uprising and during the German occupation of Poland.

Krzysztof Opaliński was a Polish szlachta (nobleman), politician, writer, satirist, and Voivode (Governor) of Poznań. A notable figure during the Swedish Deluge, Opaliński was a skilled diplomat who opposed King John II Casimir and published many of his works concerning the daily political or social matters in the Polish–Lithuanian Commonwealth.