Breast cancer is one of the leading causes of mortality among women. The aim of the current study was to assess the factors affecting awareness and beliefs regarding breast cancer, among women living in the state of Selangor, Malaysia. A cross-sectional study was conducted among women living in Selangor aged 18 to 65 years old, with a total of 483 participants. A validated questionnaire regarding awareness and belief was used. The questionnaires consist of 25 questions comprising of socio-demographic, history of other diseases, awareness and belief. The prevalence of poor awareness among women was 63.4%. while the poor level of belief was 84.7%. There was a significant association between awareness and educational background, family history of breast cancer (P=0.001, P=0.032) respectively. The association between awareness and belief was significant (P=0.02). As a conclusion: There is a high level of poor belief and poor awareness among women in Selangor, Malaysia regarding breast cancer. Source of information such as the internet plays a major role in breast cancer prevention, and the majority of them do not know the technique of breast self-examination. More health promotion is needed to target general population through big campaign of awareness.