Purpose: This study aimed to identify factors associated with the self-rated health of married immigrant women in South Korea. Methods: Data, collected in August 2018, were derived from the 2018 National Multicultural Family Survey. Study subjects were 9,230 married immigrant women. Data were analyzed using logistic regression. Results: Of the study subjects, 23.2% rated their health as poor. Results showed that individual factors (age, ethnic affiliation, duration in South Korea, and depressive symptoms); social and community networks (relationship with spouse, parenting efficacy, Korean proficiency, perceived discrimination, social support, and social activities); and living and working conditions (life satisfaction and unmet heath needs) were associated with health. Married immigrant women in their 50s or older, living in Korea for more than 15 years, experiencing depressive symptoms, low life satisfaction, and having unmet health needs were especially at high risk of poor health. Conclusion: More detailed health policy that considers age, length of stay, and country of origin. To prevent the rapidly deteriorating health of married immigrant women after middle age, mental health support should be given priority, and systematic improvement is needed to increase accessibility healthcare services.