Carlos Martínez Gorriarán is a Spanish scholar, born in San Sebastián, Basque Country, Spain. After being a member of marxist and basque nationalist movements, he became one of the founding members and spokespersons of ¡Basta Ya! association and head of the from which the Union, Progress and Democracy (UPyD) party emerged in September 2007. In ¡Basta Ya! he was opposed to ETA, and also to the "obligatory nationalism" that he considered to be occurring in the Basque Country. He is a member of the Directing and Political counsels of the party.