Diego de Aliaga Sotomayor y Santa Cruz (September 9, 1784 – November 4, 1825) was a Peruvian politician and aristocrat who served as the first Vice President of Peru, from 1823 to 1824, under the presidency of José Bernardo de Tagle y Portocarrero, Marquis of Torre Tagle, appointed by the Peruvian Congress.
At the same time, de Aliaga involved himself in commerce and communicated with conspirators who wanted to overthrow the Spanish monarchy from Peru.
When Royalist forces invaded Peru, he and the president left their jobs and handed dictatorial power to Simon Bolivar.
But then he and the president reached a backroom deal with the royalists, who failed to re-capture Peru.
Fearing reprisals of Simon Bolivar, he and the president took refuge in the Real Felipe Fortress, Callao, where he died in 1825.