Terenzio, Count Mamiani della Rovere (19 September 1799 – 21 May 1885) was an Italian writer and statesman.
He was born in Pesaro. He took part in the outbreaks at Bologna arising out of the accession of Pope Gregory XVI, and was elected deputy for Pesaro to the assembly, and subsequently appointed minister of the interior; but on the collapse of the revolutionary movement he was exiled. He did not return to Italy with the amnesty that was offered upon the accession of Pope Pius IX in 1846, because he refused to sign the declaration of loyalty that was required as a condition of the amnesty. Pressure by the revolutionaries of 1848 forced the Pope to allow the Count to return to Rome to form a ministry on May 4, 1848, but he resigned later that year due to conflicts with the Pope.
He subsequently retired to Genoa where he worked for Italian unification, was elected deputy in 1856, and in 1860 became minister of education under Cavour. In 1863 he was made minister to Greece, and in 1865 to Switzerland, and later senator and councillor of state. Meanwhile, he had founded at Genoa in 1849 the Academy of Philosophy, and in 1855 had been appointed professor of the history of philosophy at Turin; and he published several volumes, not only on philosophical and social subjects, but of poetry, among them Rinnovamento della filosofia antica italiana (1836), Teoria della Religione e dello slato (1869), Kant e l'ontologia (1879), Religione deli avenire (1880), Di un nuovo diritto europeo (1843, 1857). He died at Rome on 21 May 1885.