- Körner, S(tephan) (1913-2000) (items)
- See en.wikipedia.org/wiki/Stephan_Körner
- Kornoelje, Clifford (1912-2001); used pseudonym Jack Darrow (items) (chron.)
- See fancyclopedia.wikidot.com/jack-darrow
- Koroglu, Yigit (fl. 2010s-2020s) (items) (chron.)
- See www.yigitkoroglu.com
- Korogodski, Leonid (fl. 2010s-2020s) (items)
- See www.pinknoise.net
- Korpa, J. R.; [i.e., Javier Rodríguez Corpa] (1974- ) (items) (chron.)
- See jr-korpa.com
- Korsgaard, Sean C. W. (fl. 2020s) (items) (chron.)
- See www.korsgaardscommentary.com
- Korshak, Erle Melvin (1923-2021) (items) (chron.)
- See locusmag.com/2021/08/erle-korshak-1923-2021
- Kosko, Bart (Andrew) (1960- ) (items)
- See www.sf-encyclopedia.com/entry/kosko_bart
- Kossin, Sanford (1926- ) (items) (chron.)
- See www.macarthurmemorial.org/m_m_sanford.asp
- Kostanski, Steven (fl. 2010s) (items)
- See www.imdb.com/name/nm2725627
- Kostelanetz, Richard (Cory) (1940- ) (items) (chron.)
- See en.wikipedia.org/wiki/Richard_Kostelanetz
- Koster, Dana (fl. 2000s-2010s) (items) (chron.)
- See danakoster.com
- Koster, Pieter Paul (1945- ) (items) (chron.)
- Son of Pieter Paul Koster.
- Kostova, Elizabeth; [née Johnson] (1964- ) (items)
- See en.wikipedia.org/wiki/Elizabeth_Kostova
- Kostuj, Leszek (1973- ) (items) (chron.)
- See www.kostuj.com
- Kotani, Eric; pseudonym of Yoji Kondo (1933-2017) (items) (chron.)
- See www.sf-encyclopedia.com/entry/kotani_eric
- Kotarbinsky, Vasily; [i.e., Wilhelm Alexandrovich Kotarbinsky] (1849-1921) (items) (chron.)
- See www.askart.com/artist/Wilhelm_Aleksandrovich_Kotarbinski/11157769/Wilhelm_Aleksandrovich_Kotarbinski.aspx
- Koteliansky, S(amuel) S(olomonovich) (1880-1955) (items)
- See en.wikipedia.org/wiki/S._S._Koteliansky
- Kotker, Zane (1934- ) (items) (chron.)
- See www.zanekotker.com
- Kotsybar, James Ph(ilip) (fl. 1980s-2020s) (items) (chron.)
- See 86logic.com/pages/jamesphkotsybar
- Kotzky, Alex (1923-1996) (items) (chron.)
- See en.wikipedia.org/wiki/Alex_Kotzky
- Kotzwinkle, William E. (1938- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/kotzwinkle_william
- Koukol, Brian (fl. 2010s-2020s) (items) (chron.)
- See www.briankoukol.com
- Kovic, Peter (fl. 2010s) (items) (chron.)
- See www.beneath-ceaseless-skies.com/authors/page/21/
- Kow, Shih-Li (1968- ) (items) (chron.)
- See en.wikipedia.org/wiki/Shih-Li_Kow
- Kowal, Mary Robinette (née Harrison) (1969- ) (items) (chron.)
- See sf-encyclopedia.com/entry/kowal_mary_robinette
- Kowal, Michael (fl. 2010s) (items) (chron.)
- See kowalkowal.com
- Kowalik, Nelli (fl. 2010s) (items)
- See nellisfamousblends.com
- Koza, Martin (fl. 2010s) (items) (chron.)
- See www.mk01.deviantart.com
- Kozachenko, Alexei (1988- ) (items) (chron.)
- See nameless-designer.deviantart.com
- Kozeniewski, Stephen (fl. 2010s-2020s) (items) (chron.)
- See manuscriptsburn.blogspot.co.uk
- Kozloff, Sarah (1956- ) (items) (chron.)
- See sarahkozloff.com
- Kozlowski, Jan (fl. 2010s) (items)
- See www.jankozlowski.com
- Kraft, David Anthony (1952-2021) (items) (chron.)
- See en.wikipedia.org/wiki/David_Anthony_Kraft
- Kral, Tomas (fl. 2010s) (items) (chron.)
- See tomaskral.cz
- Kramer, Edgar Daniel (1887-1966) (items) (chron.)
- Perhaps from Philadelphia.
- Kramer, Edward E. (1961- ) (items)
- See en.wikipedia.org/wiki/Edward_E._Kramer
- Kramer, Frank (1909-1993) (items) (chron.)
- See pulpartists.com/Kramer.html
- Kramer-Rolls, Dana (1940- ); previously known as Dana Kramer (items) (chron.)
- See www.sf-encyclopedia.com/entry/kramer-rolls_dana
- Kramhøft, Lars (1984- ) (items) (chron.)
- See tegneseriecentralen.dk/project/lars-kramhoeft/
- Krasiński, Count (Napoleon Stanisław Adam Ludwig Zygmunt) (1812-1859) (items)
- See en.wikipedia.org/wiki/Count_Zygmunt_Krasinski
- Krasnostein, Alisa (fl. 2000s-2010s) (items) (chron.)
- See champagneandsocks.com
- Kraus, Daniel (1975- ) (items) (chron.)
- See en.wikipedia.org/wiki/Daniel_Kraus_(author)
- Krauss, Lawrence M(axwell) (1954- ) (items) (chron.)
- See en.wikipedia.org/wiki/Lawrence_M._Krauss
- Kreighbaum, Mark A. (1957?- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/kreighbaum_mark
- Kremer, Warren (1921-2003) (items) (chron.)
- See www.pulpartists.com/Kremer.html
- Krenkel, Roy G(erald, Jr.) (1918-1983) (items) (chron.)
- See pulpartists.com/Krenkel.html
- Krepps, Robert W(ilson) (1919-1980) (items) (chron.)
- See www.sf-encyclopedia.com/entry/krepps_robert_w
- Kress, Nancy (Anne) (1948- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/kress_nancy
- Kressel, Matthew (fl. 2000s-2020s) (items) (chron.)
- See www.matthewkressel.net
- Krick, Irving P. (1906-1966) (items)
- See en.wikipedia.org/wiki/Irving_P._Krick
- Kriesel, Michael (c1963- ) (items) (chron.)
- See www.bookthatpoet.com/poets/krieselm.html
- Krigstein, Bernard (1919-1990) (items) (chron.)
- See en.wikipedia.org/wiki/Bernard_Krigstein
- Krinard, Susan (fl. 1980s-2010s) (items)
- See en.wikipedia.org/wiki/Susan_Krinard
- Kring, Michael K. (1952- ) (items)
- See www.sf-encyclopedia.com/entry/kring_michael_k
- Krinov, E. L.; [i.e., Yevgeny Leonidovich Krinov] (1906-1984) (items)
- See en.wikipedia.org/wiki/Yevgeny_Krinov
- Krisch, Glen R. (fl. 2000s-2010s) (items) (chron.)
- See glenkrisch.wordpress.com
- Krishnan, M. L. (fl. 2020s) (items) (chron.)
- See www.mlkrishnan.com
- Kristiansen, Teddy (1964- ) (items) (chron.)
- See www.comics.org/creator/12746
- Kristjansson, Snorri (1974- ) (items)
- See snorrikristjansson.com
- Kristoff, Jay (1973- ) (items)
- See en.wikipedia.org/wiki/Jay_Kristoff
- Kritzer, Naomi (1973- ) (items) (chron.)
- See sf-encyclopedia.com/entry/kritzer_naomi
- Krizan, Vladimir (fl. 2010s) (items) (chron.)
- See sketchboook.deviantart.com
- Krog, Robert J. (fl. 2010s) (items) (chron.)
- See krogfiction.yolasite.com
- Kröger, Lisa (fl. 2020s) (items)
- See www.lisakroger.com
- Krohn, Jennifer Lynn (fl. 2010s) (items) (chron.)
- See outsideofparnassus.wordpress.com
- Krohn, Leena (1947- ) (items) (chron.)
- See en.wikipedia.org/wiki/Leena_Krohn