Back ground: Social health insurance is a program that pools the risk of several people in an effort to decrease the amount that will be paid by an individual at the time health care services are needed. In spite of higher burden of preventable disease in Ethiopia, a user-fee charge is one of the reasons for low utilization of healthcare services. The government of Ethiopian has developed health insurances strategy to increase the prepaid plan coverage, improve access to modern health care services and reduce out of pocket payments. Objective: To assess the willingness to join and pay for SHI and identify associated factors among civil servants in Merawi town, West Gojjam zone, Amhara, Ethiopia, 2021. Methods: Institutional based quantitative cross sectional study design was conducted on 597 selected civil servants using simple random sampling technique. Ten sectors were selected randomly to the study and data were collected using a structured self-administered questionnaire from December 15/2020 to January 15/2021. The collected data was entered and analyzed by SPSS version 26. Descriptive statistics results were computed and presented thorough tables, graphs and charts. Bi-variable and multivariable binary logistics regression analysis was computed with significance level of < 0.25 and < 0.05 at 95% of CI to determine the association between WTJ and WTP for SHI with independent variables respectively. The model was checked by using Hosmer-Lemshow model fitness test at p-value > 0.05. Results: Majority of respondents, 75.4 % with (95% CI: (71.9%-78.9%) of civil servants were to had WTJ and 69.5% with (95% CI: 65.5%-73.2%) of civil servants were WTP for their enrollment at 1% of contribution rate from their gross monthly salary. Good awareness for SHI [AOR=2.574; 95% CI; 1.185-5.594], respondents had no trust on the government HIA [AOR=0.023; 95% CI; 0.012-0.044], good attitude for SHI [AOR=2.424; 95% CI; 1.4-4.197] and income status of respondents who were rich [AOR=0.422; 95% CI; 0.248-0.718] were significantly associated with the willingness to join and pay for SHI among civil servants. Conclusion: Generally, majority of civil servant staffs were willingness to join and pay for SHI program before to the implementation. Hence, strengthening civil servants engagement and continuous discussions about the relevance of SHI package helps to create or build good awareness, attitude and trust as well it increases the willingness to join and pay for SHI by the civil servants.