King Coal is a 1917 novel by Upton Sinclair that describes the poor working conditions in the coal mining industry in the western United States during the 1910s, from the perspective of a single protagonist, Hal Warner. As in his earlier work, The Jungle, Sinclair uses the novel to express his socialist viewpoint. The book is based on the 1913–1914 Colorado coal strikes and written just after the Ludlow massacre.
