Purpose of investigation: Gonadotropin stimulated intrauterine insemination (IUI) cycles performed following one month after hysterosalpingography (HSG) are associated with improvement in clinical pregnancy rates in unexplained infertile couples. Materials and Methods: A retrospective cohort study was performed between 2008 and 2014. A total of 92 unexplained infertile couples undergoing their first cycle IUI stimulated by gonadotropins were included in the analysis. Participants were classified into two groups according to IUI cycles performed one month (Group A, n = 25 cycles) or longer than one month (Group B, n = 67 cycles) after the HSG procedure. Result: The overall clinical pregnancy rate was found as 25% (23 clinical pregnancies / 92 cycles). Clinical pregnancy rate was 44 % (11/25) for Group A and 17.9 % (12/67) for Group B. In Group A, there were significantly higher clinical pregnancy rates compared to Group B (OR: 3.6, 95% CI, 1.3–9.8; p = 0.012). Conclusions: It has been demonstrated that fertility improving effect of HSG was most prominent in the first six months after procedure. Likewise, in gonadotropin stimulated IUI cycles performed following one month after HSG, there seems to be an improvement in pregnancy rates in unexplained couples. In unexplained cases, it may be a reasonable approach to plan IUI cycles in the first month after HSG in clinical practice.