Luciano Marín Arango (born 16 June 1955), better known as Iván Márquez, is a Colombian guerrilla leader, member of the Revolutionary Armed Forces of Colombia (FARC), part of its secretariat higher command and advisor to the Northwestern and Caribbean blocs.

[4] Sometimes he also presented the students with books from Friedrich Engels, Karl Marx or Mao Zedong and handouts on left wing politics.

[3] As a result of peace talks with the Colombian government, Marín Arango became part of the leftist Patriotic Union (UP) party, coordinating the UP's activities in Caquetá Department.

[5] In 1986 he became a member of the Colombian Parliament for UP, but in October 1987 he left Bogotá and went to Casa Verde in La Uribe on orders from the FARC leader Jacobo Arenas.

[8] By 1988, Márquez had left the UP and returned to FARC as bloc commander, overseeing activities in the departments of Huila, Caquetá and Putumayo.

[8] In 2008 documents obtained from the computer of slain FARC chieftain Iván Ríos revealed that Márquez also led FARC's efforts to raise support in universities and high schools though "the creation of two student federations, some academics and other secondary officials, and by the infiltration of already existing university movements" [Colombian DAS intelligence director María del Pilar] Hurtado told Spanish news agency EFE.

[16] Márquez was accompanied by a security detail of about twenty militia members at the time of the attack in Caicara del Orinoco in Venezuela.

[12] According to the U.S. Department of State, Márquez oversaw loading of planes carrying 600–1200 kilograms of cocaine and the receipt of money and automatic weapons as payment.

[3] His nephew Marlon Marín became a witness to the US prosecution in an investigation on drug trafficking against the FARC leader Jesús Santrich.