The convex hull of a subset \(A\) of \(V(G)\), where \(G\) is a connected graph, is defined as the smallest convex set in \(G\) containing \(A\). The hull number of \(G\) is the cardinality of a smallest set \(A\) whose convex hull is \(V(G)\). In this paper, we give the hull number of the composition of two connected graphs.