Joaquín Belgrano (1773–1848) was an Argentine patriot, who participated in the defense of Buenos Aires against the British, and who took part in the May Revolution, as one of the neighbors attending the Cabildo Abierto of May 22, 1810.

He was born in Buenos Aires, son of Domingo Belgrano and María Josefa González Casero.

He was married to Catalina María Marcelina Melián y Correa, daughter of Antonio Melián Betancour, born in Seville, and María Josefa Correa Lescano, belonging to a Creole family of Buenos Aires..[2] Joaquín Belgrano completed his secondary education at the Royal College of San Carlos, and was possibly graduated in law in Chuquisaca.

He began his career in 1790 as a customs employee in the Aduana of Buenos Aires.

[6] He also served as judge of peace of Monserrat[7] and as deputy of the town of San José de Flores.