Background: Sexual violence is a major public health problem that affects the health and wellbeing of millions young people widely. Housemaids are the most vulnerable group to sexual violence due to their working condition, low educational and economical level. The problem ranges from physical, mental, to sexual and reproductive health problems. However they are neglected and undermined groups with poor legal protection. Evidence shows this group of population is vulnerable to all sorts of violence while the magnitudes are barely known in the study areas. Objective: To assess magnitude and associated factor of sexual violence among female house maids attending night school in Bahir Dar city North West Ethiopia 2022. Method: An institution based cross-sectional study design was conducted among 340 housemaids attending night school in Bahir Dar city from May 15 – June 20, 2022. Participants were selected using simple random sampling through computer generation technique. Data was collected using semi- structured questionnaire and face to face interview then it was entered, coded and cleaned using EPI data version 4.6.0.2 then it was exported to SPSS version 26 for analysis. First descriptive analysis was performed then binary logistic regression was done to identify associated factors for sexual violence, Crude and adjusted odd ratios with 95% confidence interval were also computed. Finally variables with P value < 0.05 were considered as statistically significant. Result: The magnitude of sexual violence among housemaids was 30.3%, 95% CI (25.3-35.38). Ever had sex (AOR=4.67; 95% CI [2.60, 8.39]), discussion of sexual and reproductive issue (AOR=2.32; 95%CI [1.29, 4.16]), Social support (AOR=2.69; 95% CI [1.32, 5.52]), school performance (AOR=0.96; 95% CI [0.93, 0.99]), and time taken to reach to school (AOR=2.04; 95% CI [1.19, 3.48]) were identified as statistically significant with sexual violence among housemaids at p<0.05. Conclusion: In this study magnitude of sexual violence among housemaid was found high. Housemaids who ever had sex, discussion of SRH, and poor social support, school performance, time taken to reach to school were more likely to be victim of sexual violence. To resolve this problem, empowering domestic workers and participating them in society is important for securing their sexual right. Key word: sexual violence, housemaid, associated factor, Bahir Dar, Ethiopia.