Excess body weight can influence the hormone production and consequently the chance of achieving pregnancy of patient undergoing ovarian hyperstimulation for in vitro fertilization embryo transfer, could be reduced. Besides, maternal obesity leads to major maternal and fetal complications. Even moderate obesity has a significant deleterious effect on pregnancy outcome. In addition, obesity is also a risk factor for breast and endometrial cancer. However, the morbidity and mortality of obesity could be minimized through appropriate obesity management.Therefore, the aim of this review was to find out the association between overweight, obesity and the reproduction outcome especially of patients undergoing controlled ovarian hyperstimulation for assisted reproduction therapy.