The Merchants' War is a 1984 satirical science fiction novel by American writer Frederik Pohl.

Set in a near future commercial dystopian interplanetary society, the novel was a sequel to The Space Merchants, and was originally co-published with it as Venus, Inc. Pohl's collaborator in the first novel, C.M.

However, agents from the trans-national corporations on Earth attempt to undermine the stability of the colony.

The story follows the trail of two advertisement company employees from the colony back to Earth, as one of them, Tennison Tarb, struggles with addiction and its effect on his advertising career.

Dave Langford reviewed The Merchants' War for White Dwarf #70, and stated that "The original 'comic inferno' ended with the hero's escape to Venus: the hero of The Merchant's War stays on Earth and reforms it, with a priggishness which wrecks the satire.