This manuscript aims to examine depression and the relationship between depression and other comorbidity diseases among women involved in prostitution in Kuala Lumpur. A total of 126 women were interviewed face to face using a structured questionnaire. The M.I.N.I Neuro-Psychiatric Interview Diagnostic Test Tool 6.0 Bahasa Malaysia Version was used to measure depression among women involved in prostitution in Kuala Lumpur. Meanwhile other comorbidity diseases were measured based on the women’s infectious disease status such as Sexually Transmitted Diseases, Hepatitis, HIV and AIDS. The results of study were analysed using SPSS software version 21. Descriptive tests were used to determine the status of depression among women involved in prostitution. The Chi-square test was used to identify the relationship between the status of other comorbidity diseases and depression among women involved in prostitution. The results of the descriptive analysis revealed that 92 out of the 126 women who were interviewed reported suffering from depression. In fact, the results of Chi Square test (p≤0.05) analysis showed that there was a significant relationship between the status of other comorbidity diseases especially Hepatitis C and depression among women involved in prostitution in Kuala Lumpur. The findings of the study indicated that women s who were positive with Hepatitis C were more prone to report depressive disorders. Therefore, mental health education program and treatment specially for women involved in prostitution need to be integrated into the prevention programs of the infectious diseases.