Malietoa Tanumafili II, addressed Susuga Malietoa Tanumafili II, was the Malietoa, the title of one of Samoa's four paramount chiefs, and the head of state, or O le Ao o le Malo, a position that he held for life, of Samoa from 1962 to 2007. He was co-head of state in 1962 with the tama-a-'aiga Tupua Tamasese Mea'ole and became the sole head of state on 15 April 1963 upon the death of his co-regent. At the time of his death, he was the oldest national leader in the world, and was also the last incumbent president for life in the world. He was also the first head of state to be a follower of the Bahá’í Faith.

Mālietoa is a state dynasty and one of the four paramount chiefly titles of Samoa. It is the titular head of one of the two great royal families of Samoa: Sā Malietoa. Literally translated as "great warrior", the title's origin comes from the final words of the Tongan warriors as they were fleeing on the beach to their boats, "Malie To`a, Malo e tau...".