Only a few studies have assessed the knowledge and attitudes about responsibility of visitors to health units during COVID-19 quarantine period. This study aimed to examine the knowledge and attitudes of clients and citizens about their role during visits to health units. Methodology: We analyzed cross-sectional data collected from 214 participants from the Bayanzurkh, Khan-Uul, and Chingeltei districts in Ulaanbaatar, Mongolia, using descriptive and multivariate logistic regression analysis

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... hods. Results: Of the total participants, 47.7% (102) of the respondents were men, 52.3% (112) were women, most of them were aged 20-24 (31.3%) and 25-29 (11.7%). The average score was 2.3, the average knowledge level was 39.35%, the average score was 1.85, and the average knowledge level was 19.9%. 54.2% of respondents know, 45.8% did not know and 74.3% did not know the provisions of Article 43.2.3 of the Law on Healthcare "Prevention of the spread of infectious diseases and compliance with the quarantine regime", which is one of the main provisions that must be observed in time of COVID-19 outbreak. Conclusion: During the outbreak of COVID-19, clients of health care organizations do not have a sufficient level of knowledge (39.3%) about their responsibilities under the law and do not follow the rules and regulations for communicable diseases.