Mario Adolfo del Carmen Fernández Baeza (born 22 November 1947 in Rancagua) is a Chilean lawyer, professor and politician, member of the Christian Democratic Party.

Afterwards he earned doctorates in political science, history, international right public and philosophy from Heidelberg University, Germany.

He served as undersecretary of Aviation and War during the governments of the presidents Patricio Aylwin and Eduardo Frei Ruiz-Tagle (1990-1993, 1994-1995 and 1996-1999).

[9][10] He resigned on 31 March 2011, to join the consulting firm Latinus and restart his teaching classes in different universities.

On 8 June 2016, president Bachelet appointed him as minister of the Interior and Public Security, in replacement of the renounced Jorge Burgos.