eng Science and Education Publishing Turkish Journal of Analysis and Number Theory 2333-1232 2019-04-04 7 2 41 49 10.12691/tjant-7-2-3 TJANT2019723 article Hüseyin Budak hsyn.budak@gmail.com 1 Fuat Usta 1 Tuba Tunç 1 Mehmet Zeki Sarıkaya 1 Department of Mathematics, Faculty of Science and Arts, Düzce University, Düzce,Turkey In this paper, we first obtain the useful identity for double integrals via fractional integral operators. Then with the help of this identity we outline some significant Ostrowski type integral inequalities for functions in two variables. In accordance with this purpose we benefit from the properties of bounded function and concave mappings on co-ordinates. The established results are extensions of some existing Ostrowski type inequalities in the previous published studies. http://pubs.sciepub.com/tjant/7/2/3/tjant-7-2-3.pdf Ostrowski inequality fractional integral operators convex function