Luciano Marín Arango, aka "Iván Márquez" (born 1955 in Florencia, Caquetá) 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.
He was part of the FARC negotiators that concluded a peace agreement with the Colombian president Juan Manuel Santos.
On 29 August 2019, Márquez abandoned the peace process and announced a renewed armed conflict with the Colombian government.