Document Type: Original Article
Department of Mathematics, Faculty of Technical Science, University ”Ismail Qemali”, Vlora, Albania.
College of Science, China Three Gorges University, 443002, Yichang, P. R. China.
In the present paper, the notion of generalized beta $(r,g)$-preinvex function is applied for establish some new generalizations of Ostrowski type inequalities via fractional integral operators. These results not only extend the results appeared in the literature  but also provide new estimates on these type. At the end, some applications to special means are given.