- Kadrey, Richard (Albert) (1957- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/kadrey_richard
- Kafka, Franz (1883-1924) (stories)
- See en.wikipedia.org/wiki/Kafka
- Kagey, Rudolf (Hornaday) (1904-1946) (stories)
- Born in Tuscola, Illinois; graduate of the University of Illinois; Professor of Philosophy in New York; died in Manhattan.
- Kahler, Hugh (Torbert) MacNair (1883-1969) (stories)
- Born in Philadelphia; educated at Princeton University; contributed fiction to numerous magazines.
- Kalez, Jay J. (1895-1982) (stories)
- Writer. Born in Spokane, Washington.
- Kalteis, Dietrich (fl. 2010s) (stories) (art) (assoc.)
- See dietrichkalteis.blogspot.co.uk
- Kane, Henry (J.) (1908-1988) (stories) (assoc.)
- See www.mulhollandbooks.com/2010/11/22/the-murders-in-memory-lane-remembering-henry-kane
- Kantner, (Timothy) Rob(in) (1952- ) (stories) (assoc.)
- Author of short stories, many featuring the series character in the listed books; living in Detroit area since 1972.
- Kantor, Loren (fl. 2000s-2010s) (stories) (assoc.)
- See woodcuttingfool.blogspot.co.uk
- Kantor, MacKinlay (1904-1977) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/kantor_mackinlay
- Kapetansky, Seymour (1919-2001) (stories)
- See variety.com/2001/scene/people-news/seymour-kapetansky-1117794271
- Karageorge, Penelope (1935- ) (stories)
- Newspaper and magazine writer.
- Karanovic, Milos (1993- ) (stories) (assoc.)
- See www.plavidemon.com
- Kareska, Lane (fl. 2010s) (stories)
- See www.lanekareska.com
- Kark, Austen (Steven) (1926-2002) (stories)
- Born in London; educated at Oxford; reporter for and then head of BBC World Service. Husband of Nina Bawden.
- Karney, Jack (1911- ) (stories)
- Born in New York City; worked in New York City D.A.s office.
- Karp, David (1922-1999) (stories)
- See www.sf-encyclopedia.com/entry/karp_david
- Karst, Leslie (fl. 2010s) (stories) (assoc.)
- See www.lesliekarstauthor.com
- Kastel, Warren; house pseudonym (fl. 1940s-1950s) (stories)
- See www.sf-encyclopedia.com/entry/kastel_warren
- Kastle, Herbert D(avid) (1924-1987) (stories)
- See lynn-munroe-books.com/list59/herbertkastle.htm
- Kastura, Thomas (1966- ) (stories)
- See www.thomaskastura.de
- Katsu, Alma (fl. 2010s) (stories) (assoc.)
- See www.almakatsu.com
- Katterjohn, Monte M. (1891-1949) (stories)
- See en.wikipedia.org/wiki/Monte_M._Katterjohn
- Kauffman, Reginald Wright (1877-1959) (stories)
- Born and mostly lived in Lancaster, Pa.; graduate of Harvard; editor of Bangor, Maine, newspaper in 1940s.
- Kaufman, Al(fred) (1918-1977) (stories)
- See michaelmaslin.com/inkspill/al-kaufman-photos-surface/
- Kaufman, Lenard (1913-1992) (stories)
- Born in New York City.
- Kauten, Mat(hias) (1911-1977) (art)
- See pulpartists.com/Kauten.html
- Kaye, Marvin (Nathan) (1938- ) (stories)
- See www.sf-encyclopedia.com/entry/kaye_marvin
- Kaylin, Walter (1921-2017) (stories)
- See walterkaylin.com
- Kayser, Ronal (1905-1988) (stories)
- Writer and journalist. Born in the midwestern United States; lived in La Jolla, California.
- Keating, Charles (1941-2014) (stories) (assoc.)
- See en.wikipedia.org/wiki/Charles_Keating_(actor)
- Keating, H(enry) R(eymond) F(itzwalter) (1926-2011) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/keating_h_r_f
- Keaton, David James (fl. 2000s-2010s) (stories) (assoc.)
- See davidjameskeaton.com
- Keaton, M. (fl. 2000s-2010s) (stories)
- See en.wikipedia.org/wiki/M._Keaton
- Keeler, Harry Stephen (1889-1967) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/keeler_harry_stephen
- Keene, Day; pseudonym of Gunard Hjertstedt (1904-1969) (stories)
- See www.sf-encyclopedia.com/entry/keene_day
- Keevil, Henry John (1914-1978) (stories)
- See bearalley.blogspot.co.uk/2013/07/henry-john-keevill.html
- Kelland, Clarence Budington (1881-1964) (stories)
- Born in Portland, Michigan; educated at Detroit College of Law.
- Keller, David H(enry), M.D. (1880-1966) (stories)
- See www.sf-encyclopedia.com/entry/keller_david_h_m_d
- Keller, H(arry) A. (1894-1973?) (stories)
- Born in Philadelphia. Editor of mystery and detective story magazines.
- Keller, (Charles) Reamer (1905-1994) (stories)
- See en.wikipedia.org/wiki/Reamer_Keller
- Kelley, Edith Summers (1884-1956) (stories)
- See en.wikipedia.org/wiki/Edith_Summers_Kelley
- Kelley, Leo P(atrick) (1928-2002) (stories)
- See www.sf-encyclopedia.com/entry/kelley_leo_p
- Kelley, Thomas P(atrick) (1905-1982) (stories)
- See www.sf-encyclopedia.com/entry/kelley_thomas_p
- Kelliher, Dan T. (1910-1995) (stories)
- Newspaper reporter and feature writer in Kansas City.
- Kelly, Fred C(harters) (1882-1959) (stories)
- See en.wikipedia.org/wiki/Fred_C._Kelly
- Kelly, Jane (1949- ) (art)
- Native of Philadelphia; has M.S. in Information Science from Drexel Univ.; has over 20 years experience in development, marketing and support of information products.
- Kelly, Susan (B.) (1955- ) (stories)
- Born in Chilterns, raised in Oxford, living in London; trained as a computer consultant.
- Kelsey, (Audrey) Vera (1892-1961) (stories)
- Born in Winnipeg, raised in Grand Forks, North Dakota; had degrees in sociology; taught college English; feature writer for North China Daily News 1920-1925; freelance magazine writer.
- Kelston, Beatrice; pseudonym of Adelaide Janetta Bluett-Duncan (1876-1951) (stories)
- See bearalley.blogspot.co.uk/2015/05/beatrice-kelston.html
- Kemanis, V. S. (fl. 2010s) (stories)
- See www.vskemanis.com/biography
- Kemp, H(arold) S(tuart) M(iller) (1892-?) (stories)
- Writer. Born in England, lived in Canada.
- Kendrick, Patrick (fl. 2010s) (stories) (assoc.)
- See www.talesofpatrickkendrick.com
- Kennedy, Mary (fl. 2000s) (stories)
- See www.marykennedy.net
- Kennett, Shirley (Ann) (1951- ) (stories)
- Corporate computer specialist.
- Kent, Kelvin; joint pseudonym of Arthur K. Barnes (1911-1969) & Henry Kuttner (1915-1958) (stories)
- See www.sf-encyclopedia.com/entry/kent_kelvin
- Kerigan, Florence (1896-1984) (stories)
- See www.sf-encyclopedia.com/entry/kerigan_florence
- Kermit, Lance; house pseudonym (fl. 1940s-1960s) (stories)
- A house pseudonym of Popular Publications, used by at least fifteen people in as many different magazines. Alden Norton wrote two pieces; it is possible that Roy Ald is responsible for the remaining piece.
- Kerner, Ben (1913-2000) (stories)
- Radio and TV writer.
- Kerns, Art (fl. 2010s) (stories)
- See www.arthurkerns.com
- Kerr, Philip (1956-2018) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/kerr_philip
- Kersh, Gerald (1911-1968) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/kersh_gerald
- Ketchum, Jack; pseudonym of Dallas William Mayr (1946-2018) (stories) (assoc.)
- See en.wikipedia.org/wiki/Jack_Ketchum
- Ketchum, Philip (L.) (1902-1969) (stories)
- Born and educated in Colorado; in social work for 10 years before turning to writing and moving to California.
- Key, Alexander (Hill) (1904-1979) (stories)
- See www.sf-encyclopedia.com/entry/key_alexander
- Keyes, Daniel (1927-2014) (stories)
- See www.sf-encyclopedia.com/entry/keyes_daniel
- Keyhoe, Donald E(dward) (1897-1988) (stories)
- See www.sf-encyclopedia.com/entry/keyhoe_donald_e
- Kiemle, Henry W(illiam, Jr.) (1908-1969) (art)
- See pulpartists.com/Kiemle.html
- Kiewlak, Mark Joseph (fl. 1990s-2010s) (stories)
- See www.bewilderingstories.com/bios/kiewlak_bio.html
- Kildare, Owen Frawley (1864-1911) (stories)
- See bearalley.blogspot.co.uk/2015/09/owen-kildare-part-1.html
- Kilduff, Paul (1964- ) (stories)
- Born and living in Dublin; a vice-president with Merrill Lynch & Co., Inc.
- Kilgore, Carol (fl. 1990s-2010s) (stories)
- See www.carolkilgore.net
- Killough, (Karen) Lee (1942- ) (stories)
- See www.sf-encyclopedia.com/entry/killough_lee
- Kilman, Julian; pseudonym of Leroy N. Kilman (1878-1954) (stories)
- See desturmobed.blogspot.co.uk/2012/03/julian-kilman.html
- Kilman, Leroy N(oble) (1878-1954) (stories)
- See desturmobed.blogspot.co.uk/2012/03/julian-kilman.html
- Kilpatrick, Lewis H(olman) (1895-1971) (stories)
- Probably from Mount Sterling, Kentucky.
- Kimberly, Gail [i.e., Gail Kimberly Francis] (1937-2011) (stories)
- See www.sf-encyclopedia.com/entry/kimberly_gail
- King, C(harles) Daly [Ph.D.] (1895-1963) (stories)
- Born in New York City; had degrees from Yale and Columbia Universities; engaged in psychological research.
- King, (James) Clifford (1912-1991) (stories)
- Born in Kenniford, England; died in Fulham, London.
- King, Dana (fl. 2010s) (stories) (assoc.)
- See danaking.blogspot.co.uk
- King, Frank (1892-1958) (stories)
- Born in Halifax; educated at Leeds University; a physician.
- King, Rufus (Frederick) (1893-1966) (stories)
- See www.sf-encyclopedia.com/entry/king_rufus
- King, (Raymond) Sherwood (1904-1981?) (stories)
- Born in Yonkers, New York; graduate of Marquette University; in advertising and sales work, and a newspaper contributor in Chicago.
- King, Stephen (Edwin) (1947- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Stephen_King
- Kinsella, Edward (1983- ) (art)
- See www.edwardkinsellaillustration.com
- Kinstler, Everett Raymond (1926-2019) (art)
- See pulpartists.com/Kinstler.html
- Kipling, (Joseph) Rudyard (1865-1936) (stories) (assoc.)
- See en.wikipedia.org/wiki/Rudyard_Kipling
- Kippax, John; pseudonym of John Hynam (1915-1974) (stories)
- See www.sf-encyclopedia.com/entry/kippax_john
- Kirchner, Harry (1912-1988) (art)
- See pulpartists.com/Kirchner.html
- Kirk, Justin ({c}1982- ) (stories)
- See www.thegazette.com/subject/opinion/guest-columnists/this-writer-should-scare-kids-away-from-gang-life-20141130
- Kirkman, Isaac (fl. 2010s) (stories)
- See about.me/isaac.kirkman
- Kittredge, Mary [i.e., Mary Elizabeth Talbot Kittredge Squibb] (1949- ) (stories)
- Author of science fiction; respiratory therapist at hospital in Connecticut.
- Kiyoharu, Matsumoto (1909-1992) (stories)
- Prize-winning and prolific Japanese mystery writer.
- Kjelgaard, Jim [i.e., James Arthur Kjelgaard] (1910-1959) (stories)
- See www.sf-encyclopedia.com/entry/kjelgaard_jim
- Klacar, Pamela [née Anderson] (fl. 1970s-1990s) (stories)
- See www.austlit.edu.au/austlit/page/A26208
- Klausner, Harriet (1952-2015) (stories)
- See en.wikipedia.org/wiki/Harriet_Klausner
- Kleinfeld, Lenny (fl. 1970s-2000s) (stories)
- See www.lennykleinfeld.com
- Kline, Otis Adelbert (1891-1946) (stories)
- See www.sf-encyclopedia.com/entry/kline_otis_adelbert