Javier Arzalluz Antia (24 August 1932 – 28 February 2019) was a Spanish politician. He was leader of the Basque Nationalist Party from 1979 until 2004. He was a nationalist and a Christian Democrat. He was born in Azcoitia, Basque Country.
Besides his political role, he had also been a professor of Constitutional Law (in the Basque language) at the University of Deusto in Bilbao until 1999.