Mario Ramón Beteta Monsalve (7 July 1925 – 5 October 2004) was a Mexican economist who served as the last Secretary of Finance in the cabinet of President Luis Echeverría (1975–76), as director-general of Pemex (1982–87) and as governor of the State of México (1987–89).

[2] He graduated from the National Autonomous University of Mexico (UNAM) with a bachelor's degree in Law (1948), completed a master's degree in economics at the University of Wisconsin (1950) and married Gloria Leal Kuri before working as a professor of Introductory Economics and Monetary Theory at the National School of Economics (UNAM, 1951–59).

[2] He worked as director-general of Credit (1964–70) and then as Undersecretary of the Treasury (1970–75) at the Secretariat of Finance,[2] and when the secretary, José López Portillo, resigned to run for president as candidate of the Institutional Revolutionary Party (PRI), Beteta was appointed as substitute.

[2] He died in Mexico City on 5 October 2004, victim of a chronic lung disease.

[1] His nephew, Óscar Mario Beteta, is a popular radio host in Mexico City.