The Peruvian nitrate monopoly was a state-owned enterprise over the mining and sale of saltpeter (sodium nitrate) created by the government of Peru in 1875 and operated by the . Peru intended for the monopoly to capitalize on the world market's high demand for nitrates, thereby increasing the country's fiscal revenues and supplementing the financial role that guano sales had provided for the nation during the Guano Era (1840s-1860s).