Dragon War is a fantasy novel Chinese-American author Laurence Yep first published in 1992. It is the fourth and final book in his Dragon series. Yep attempted to put the beauty and gallantry of dragons he had gleaned from his research of them in Chinese mythology into Dragon War. By contrast, in the first three books of the series he "had tried to capture their quirkiness and strength".

The story picks up where Dragon Cauldron left off. Exiled dragon princess Shimmer along with Indigo and Monkey attempt to rescue Thorn, whose soul is trapped within Baldy's cauldron. The cauldron is now possessed by the powerful immortal wizard known as the Boneless King, who has possessed the body of the tyrannical human king known as the Butcher and launched an all out war against the dragons with the aid of Shimmer's brother Pomfret.

After being captured by the Boneless King, Shimmer, Monkey, and Indigo are transported back to Egg Mountain in chains. After Shimmer creates illusions of her, Monkey and Indigo while their guards and Pomfret are distracted, they escape and attempt to retrieve Baldy's cauldron, in which Thorn's soul is now sealed. However the Boneless King turns the tables on them and they are trapped underground cavern beneath Egg Mountain where the he was formerly imprisoned with the river poisoned and the whole cavern sealed up. Indigo figures out that water is the exclusion to the barrier spell as the river can flow in, so transformed into ice versions of themselves, they are able to swim against the river current and out from beneath Egg Mountain. Returning to the Boneless King's tomb disguised as soldiers, they find that he has finished his excavation and left. They manage to catch up to where the pack train is camped for the night, but are unable to bluff their way past the pickets and are forced to transform into horses. They discover that some of the guardsmen and horses have been poisoned from drinking the river water and that the pack train is transporting the stone soldiers that were found in the Boneless King's tomb. Disguised as horses, they accompany the pack train on its journey over the next several days. On the way, mysterious gases emitted by the statues follow the pack train, arousing such resentment and fear from the population such that "the countryside was almost ready to rise in rebellion" by the time they reach the capital, Ramsgate. The pack train is nearly attacked by villagers just at the capital's gates, but is saved by reinforcements. The statues are taken inside the city and buried in a pit on the palace grounds.