Marino Marini (8 March 1804 – 15 April 1885) was an Italian prelate of the Catholic Church, who worked in the diplomatic service of the Holy See and the Roman Curia.
He worked in the nunciature in Madrid, then studied civil and canon law in Rome.
He was a member of special pontifical delegations for briefs periods in Argentina and Mexico and then worked in the nunciature in Brazil from 1853 to 1856.
On 19 June 1857 he was appointed titular archbishop of Palmyra and Apostolic Delegate to Argentina, Bolivia, Chile, Uruguay, and Paraguay.
Beginning in 1868 he held positions in the Roman Curia, including Secretary of the Congregation for Extraordinary Ecclesiastical Affairs and Substitute of the Secretariat of State.