Introduction Dual contraception is a method used to prevent sexually transmitted infections (STIs) including Human Immunodeficiency Virus (HIV) and unintended pregnancies. Prevention of unintended pregnancy in people living with HIV (PLHIV) and ART given to pregnant women to suppress viral load prevent transmission of HIV to children. Counseling and provision of dual contraceptive methods is a very cost-effective method to tackle this double burden among women living with HIV. However, little has been known about utilization of dual methods among HIV positive women in Bishoftu town and its surroundings. Objective The aim of this study was to assess dual contraception method utilization and associated factors among reproductive age women who were on antiretroviral therapy in public health facilities of Bishoftu town. Methods A facility based cross- sectional study was conducted from November 01 to December 30, 2020. The study participants were selected by using simple random sampling technique. Data were collected using a pretested and structured questionnaire through a face to face interview. Data were processed and analyzed using SPSS version 20. Frequencies and percentages were used to describe characteristics of participants. Bivariable and multivariable logistic regression analyses were used to identify variables which had an independent association with the dependent variable. The degree of association between dependent and independent variables were measured using odds ratio with 95% confidence interval. Level of significance was set at a p-value less than 0.05. Results The Magnitude of dual contraceptive utilization of women living with HIV in Bishoftu town was 56.9% (95% Cl (51.6, 62.1). Being married (AOR = 4.33; 95% Cl (1.67, 11.27), not getting pregnant since the start of chronic care follow up (AOR = 2.19; 95% Cl (2.90, 3.70), having a partner positive for HIV (AOR = 2.67; 95% Cl (1.34, 5.32) and having a partner negative for HIV (AOR = 2.38; 95% Cl (1.09, 5.20) were factors independently associated with dual method contraceptive use. Conclusion The study showed that use of dual contraceptive methods was low; factors like marital status, partner HIV status, and pregnancy after chronic HIV care follow up were found to be significantly associated with dual contraceptive method use. In addition to ART, use of dual contraceptive methods utilization may play a role in prevention of HIV infection in children and is important in the prevention of unintended pregnancy.