<![CDATA[Abstract The quality of health services is one of the indicators to assess the success and satisfaction of patients related to the service system while determining the loyalty and image of health institutions. The purpose of this study is to analyze the influence of the assurance dimension in the quality of health services on the satisfaction of inpatients and outpatients in hospitals. This study is a meta-analysis and systematic review study using the PRISMA diagram. Article searches used databases from Google Scholar published in 2015-2025. Article search keywords include "Service Quality" AND "Assurance" OR "Guarantee" AND "Patient Satisfaction" AND "Inpatient" AND "Outpatient" AND "Cross Sectional". Articles were analyzed using the PRISMA diagram and the Review Mager 5.4 application. The meta-analysis consisted of 14 cross-sectional articles, namely 6 articles on inpatients and 8 articles on outpatients. Good assurance/guarantee increases inpatient satisfaction by 3.96 times compared to service quality with poor assurance/guarantee (aOR= 3.96; 95% CI = 2.02 to 7.73; p = 0.02) and the results are statistically significant. Good assurance/guarantee increases outpatient satisfaction by 3.96 times compared to service quality with poor assurance/guarantee (aOR= 5.18; 95% CI = 2.50 to 10.70; p = 0.005) and the results are statistically significant Keywords: meta-analysis, assurance, patient satisfaction, hospital]]>
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