The effect of indoor radon on the fertility of women was studied for the first time in Kurdistan. The Lowest radon was 99.94 Bq·m^-3, 94.883 Bq·m^-3 and highest radon concentrations were 360.112 Bq·m^-3 and 357.832 Bq·m^-3 in kitchens and living rooms in Sulaymania. Lowest radon was 97.886 Bq·m^-3 and 95.113 Bq·m^-3, and the highest concentrations were 360.112 Bq·m^-3 and 357.832 Bq·m^-3 in kitchens and living rooms in Erbil, respectively, which were significant (p<0.001). This result is above the normal limits and the action level provided by the international environmental organizations of 148 Bq·m^-3. The indoor radon concentration in Iraqi Kurdistan was high in many houses, which affects women’s fertility.