THE ZERO DIVISOR GRAPH OF A PARTIALLY ORDERED SET (POSET, BRIEY) WITH THE LEAST ELEMENT 0, WHICH IS DENOTED BY G* (P), IS AN UNDIRECTED GRAPH WITH VERTEX SET P*=P\ {0} AND, FOR TWO DISTINCT VERTICES X AND Y, X IS ADJACENT TO Y IN G* (P) IF AND ONLY IF {X, Y}L={0}, WHERE, FOR A SUBSET S OF P, SL IS THE SET OF ALL ELEMENTS X 2 P WITH X £S FOR ALL S Î S. IN THIS PAPER WE STUDY THE PROJECTIVITY OF THE ZERO DIVISOR GRAPH G* (P).