The Nacionalista Party is a political party in the Philippines that is the oldest existing party in the country and in Southeast Asia. It was responsible for leading the country throughout most of the 20th century since its founding in 1907; it was the ruling party from 1935 to 1946, 1953 to 1961, and 1965 to 1978, and also was one of the two dominant political parties throughout the existence of the Third Republic.