Longri Ao (1906–1981), also known by name Longritangchetha, was an indigenenous Baptist missionary from the North-Eastern state of India, Nagaland. He was a missionary to the Konyak people and a peacemaker. He is known to have risked his life to restore peace in Nagaland, and to negotiate a ceasefire agreement between the Government of India and underground leaders fighting for Nagaland secession from India.