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Jingo is the fourth novel in Terry Pratchett's Discworld series, which mocks aggressive grief-patriotism and unreasonable warrior enthusiasm.

Suddenly, a whole island has risen from the depths of the Round Sea... and, of course, the closest to it Ank-Morpork and their maritime neighbour Haponia claim the new territory and are even ready to start a war for it. However, readiness in the case of the Ankh-Morporkians means only a brave fighting spirit. Commander of the Watch Samuel Wymes feels the wind in the city change so much that he can't tell who is friend and who is foe and tries to stop what is probably the biggest crime of his career at any cost.

Meanwhile, Lord Vetinari, as a skilful politician accustomed to juggling the interests of influential people, is trying to keep the city afloat. The brilliant inventor Leonard of Quirma and the much less gifted guards, who will unexpectedly reveal their potential, will help him in this.