Abstract : Breast cancer is one of the most important malignant diseases all over the world. Incidence of breast cancer is increasing around the world and it is still the leading cause of cancer mortality worldwide with an estimated 1.3 million new cases diagnosed annually. As areas become more developed, breast cancer risk factors such as obesity, early menarche, alcohol consumption and smoking, environmental pollution and decreased or late childbearing are becoming more prevalent. In Iraq, breast cancer ranks first among types of cancers diagnosed in women. This study was conducted on one hundred twenty women with breast cancer that were evaluated and investigated for the possible role of the risk factors on the development of breast cancer in females. The work had been conducted in Baghdad Medical City Hospital. Information on data include woman's age of breast cancer, marital status, number of full pregnancies, lactation period, woman’s education, age at menarche, woman's social habit like smoking, hormonal therapy use and family history of breast cancer were collected by self-administered questionnaires. Data were collected and analyzed statistically. Differences were significant at (p˂0.05). It is concluded that there is a strong correlation between breast cancer and the risk factors among most of the parameters used