William King (born 7 December 1959), also known as Bill King, is a Scottish writer of a number of science fiction and fantasy books, most notably in Games Workshop's Warhammer and Warhammer 40,000 series, published by Games Workshop's fiction arm Black Library.

King wrote Trollslayer (1999), the first novel published under the Games Workshop's Black Library label.

[1] His most memorable characters, Gotrek and Felix, have appeared in a series of novels, beginning with Trollslayer, a collection of previously published and new short stories.

Prior to moving to the Czech Republic, King spent a number of years as a designer for GW, contributing to their game universes (where much of his fiction is also set).

King's latest work has been Illidan: World of Warcraft for Blizzard Entertainment, released in March 2016.