MacKinlay Kantor

If the South had Won the Civil War  (Vector 222, March-April 2002)

David Karp

One  (SF Site, mid-February 2011)

Marjorie Bradley Kellogg & William B. Rossow

The Wave and the Flame & Reign of Fire  (Critical Wave 6, July-August 1988)

James Patrick Kelly & John Kessel (eds)

Rewired: The Post-Cyberpunk Anthology  (SF Site, April 2008)
The Secret History of Science Fiction  (Strange Horizons, 19 March 2010) 
Nebula Awards Showcase 2012  (LA Review of Books, 3 September 2012)
Digital Rapture   (SF Site, mid-January 2013) 

Leigh Kennedy

Saint Hiroshima  (Literary Review, November 1987)
Wind Angels  (Foundation 114, Spring 2012/13) 

John Kessel

The Baum Plan for Financial Independence and Other Stories  (SF Site, Mid-November 2008)

Crawford Kilian

The Empire of Time  (Critical Wave 5, May-June 1988)

Garry Kilworth

Split Second  (Vector 96, December 1979-January 1980)
Witch-Water Country & Tree Messiah  (Vector 135, December 1986-January 1987)
Cloudrock  (Vector 145, August-September 1988)
In the Hollow of the Deep Sea Wave  (Paperback Inferno 84, June-July 1990)
On My Way to Samarkand  (SF Site, mid-July 2013) 

Garry Kilworth & Robert Holdstock

Poems, Peoms and Other Atrocities  (Foundation 122, December 2015)

Kathe Koja

Extremities  (The New York Review of Science Fiction 155, July 2001)

William Kotzwinkle

The Amphora Project  (SF Site, June 2006)

Nancy Kress

Crossfire (New York Review of Science Fiction 179, July 2003)

Michael P. Kube-McDowell

Alternities  (Paperback Inferno 83, April-May 1990)