Abraham Guillén (13 March 1913 – 1 August 1993), was a Spanish author, economist and educator.
He was a veteran of Spanish Civil War, influenced by anarchism.
One of the most prolific revolutionary writers in Latin America during the 1960s and intellectual mentor of Uruguay's revolutionary Movement of National Liberation (Tupamaros).
He is most widely known as the author of Strategy of the Urban Guerrilla, which played an important role in the activities of urban guerrillas in Uruguay, Argentina and Brazil.