Piergiuseppe Vacchelli (born 4 February 1937) is the current adjunct secretary emeritus of the Congregation for the Evangelization of Peoples and president of the Pontifical Mission Societies since his retirement was accepted by Pope Benedict XVI on 26 June 2012.

He previously served as under-secretary of the Italian Episcopal Conference and chairman of its Charitable Assistance for the Third World.

From late 1961 to autumn 1963, he exercised his priestly ministry in the Parish of St. John Cross.

Over the years he taught canon law and religion in the diocesan seminary at the School of Science and Letters Institute.

From October 1996 he held the office of undersecretary of the Italian Episcopal Conference and chairman of its committee for charitable aid for developing countries.