eng Science and Education Publishing Turkish Journal of Analysis and Number Theory 2333-1232 2019-11-20 7 6 140 144 10.12691/tjant-7-6-1 TJANT2019761 article Serap ?zcan Corresponding author: serapozcann@yahoo.com 1 Department of Mathematics, Faculty of Science and Arts, K?rklareli University, K?rklareli, Turkey In this paper, with a new approach, some new Hermite-Hadamard type inequalities for preinvex functions are obtained by using only the right Riemann-Liouville fractional integrals. Our results generalize previous studies. Results proved in this paper may stimulate further research in this field. http://pubs.sciepub.com/tjant/7/6/1/tjant-7-6-1.pdf Preinvex functions Hermite-Hadamard inequalities right Riemann-Liouville fractional integral