Joaquim António de Aguiar (
Coimbra, 24 August 1792 –
Lisbon, 26 May 1884) was a Portuguese politician. He held several relevant political posts during the Portuguese constitutional monarchy, namely as leader of the
Cartists and later of the
Partido Regenerador . He was three times prime minister of Portugal: between 1841 and 1842, in 1860 and finally from 1865 to 1868, when he entered a coalition with the
Partido Progressista (English: Progressist Party), in what became known as the
Governo de Fusão (English: Fusion Government).