Abstract

Important personality of the Orthodox and Ecumenical Theology, Nikos Nissiotis has offered many contributions in topics like the Orthodox Ecclesiology, Eschatology, Christology, Theology of Second Vatican Council, Baptism, Eucharist and Ministry, and s. o. He was also active part of the Ecumenical Movement and, as professor at Bossey Ecumenical Institute and member of different commissions of WCC, has also issued a lot of documents very useful until today in the ecumenical dialogue. As Orthodox observer at Second Vatican Council, he published also some important articles, often quoted, on this topic. Also of his important contributions is in the understanding of mission through an ecumenical context, but from an Orthodox point of view. Despite of its importance, this contribution of the aforementioned author was not enough highlighted until now. Therefore, analysing his most important publications dedicated to this topic, we will try there to emphasize his contribution on it.