Background: Infertility is defined as failure to conceive after one year and 6 months of a regular unprotected relationships between couples, it is classified as primary infertility when there is no history of pregnancy have occurred , or secondary when inability to conceive occurs after one or more successful pregnancies . Female infertility is a multifactorial condition caused by many causes like ovarian, PCOS, uterine, and cervical factors, and associated with many risk factors as family history, obesity, blood group types, age and educational level of women. Some medical diseases implicated in causing female infertility mainly thyroid disorders by hormonal disturbance and menstrual irregularity. Aim: This study aims to identify the epidemiological factors among reproductive age women attending Obstetrics and gynecology outpatient department in sallahuddin teaching hospital.Subject and Methods: This is a cross section study conducted on reproductive age women attending gynecological and obstetrical outpatient department in Salahuddin Teaching Hospital during the period from 1 5th October 2018 to 15 th April 2019 to identify the frequency, types, causes and sociodemographic associated factors with female infertility. The information regarding the problem and demographic characteristics was obtained according to questionnaire and body weight, height and BMI were recorded.Results: This study revealed that frequency of female infertility was 25% with a highest percentage of primary infertility 57% . PCOS where the main ovulatory causes of female infertility constituted about 41%.followed by other risk factors as tubal, uterine, and cervical factors.Conclusion: female infertility constituted abut quarter the causes of infertility among reproductive age women in Tikrit city .Primary infertility were the commonest type,most frequent among those between(20_24years age) .PCOS were the major ovulatory causes.