Background: The novel corona virus disease outbreak which was first detected in China is caused by sever acute respiratory syndrome corona virus 2. In Ethiopia, poor perception about COVID-19 prevention methods might be one of determinant factor to the low utilization of adopted prevention measures and increasing of cases. However, it was unknown to what extent individuals were perceived the efficacy of those measures. Hence, this study was aimed to assess perceived efficacy of COVID-19 preventive measures and intention to carry out those methods among chronic disease patients. Methods: Institutional based cross sectional study was conducted among 413 chronic disease patients from 21 July - 5 August, 2020. A pre-tested interviewer administered structured questionnaire was used for data collection. Both binary and multivariable logistic regression analyses were used and in multivariable analysis, variables were declared statistically significant at p-value of < 0.05. Results: In overall, 42.1% of participants had low perception to the efficacy of COVID-19 prevention measures and 28.3% had low intention to carry out those prevention measures. In this study, young adults (AOR=2.48; 95% CI: 1.42-4.31), male gender (AOR=2.75; 95% CI: 1.73-4.37), uneducated (AOR=3.42; 95% CI: 1.47-7.94) and face mask non-users (AOR=1.64; 95% CI: 1.03-2.61) were significantly associated with low perceived efficacy of COVID-19 prevention methods. However, male gender (AOR=2.06; 95% CI: 1.28-3.31), rural residents (AOR=1.89; 95% CI: 1.16-3.07) and patients with longer duration of chronic disease (AOR= 2.19; 95% CI: 1.19-4.01) were significantly associated with low intention to carry out COVID-19 prevention methods.Conclusion: In this study, significant proportion of patients (42%) had low perception about the efficacy of COVID-19 prevention measures and nearly one-third of participants (28.3%) had low intention to carry out those measures. Thus, interventions aimed to enhance patients’ attitude and behavioral changes on COVID-19 prevention measures have to be provided.