Marcos Paz (1813 – January 2, 1868) was Governor of Córdoba and Tucumán Provinces, an Argentine Senator, and Vice President of Argentina from October 12, 1862, until his death in 1868.

He then assisted general Wesceslao Paunero, who was sent as an envoy by Mitre to other provincial leaders, and served briefly in his stead as Governor of Córdoba, from December 1861 to March 1862.

An erstwhile foe, Buenos Aires leader Bartolomé Mitre, befriended Paz during earlier negotiations, and nominated him as running mate for the 1862 elections.

When Mitre was away commanding the allied forces during the Paraguayan War, Paz fulfilled the role of acting president.

He died in office on January 2, 1868, in Buenos Aires, as a victim of a Cholera epidemic, and Mitre had to return to Argentina to resume his position as president.