Introduction: The Malay Version of EORTC-QLQ C30 was validated among Malaysian women who had undergone breast cancer surgery. Materials and Methods: Test-retest evaluation (i.e. three weeks and ten weeks following surgery) was carried out to examine the validity and reliability of the scale. The Cronbach’s alpha value was used to determine the internal consistency, meanwhile, test-retest Intraclass Correlation Coeffi cients (ICC) indicates the reliability of the scale. Effect Size Index and Mean Differences interpret the sensitivity of the scale. Discriminant validity was evaluated by comparing two groups i.e. women who had mastectomy and women who had lumpectomy. Results: Internal consistencies are acceptable for Global Health Status (0.91), Functional domains (ranging from 0.50-0.89) and Symptomatology domains (ranging from 0.75-0.99). Intraclass Correlation Coeffi cient (ICC) ranged from 0.05 to 0.99 for Global Health Status and Functional domains, and ranged from 0.13 to 1.00 for Symptomatology domains. Sensitivity of the scale was observed in nearly all of the domains. Conclusion: The Malay Version of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC-QLQ C30) is a suitable tool to measure the quality of life of women with breast cancer.