The coronavirus disease 2019 (COVID-19) pandemic has had a severe impact on people with type 2 diabete (T2D) and their health behaviors. This study investigated the associations between T2D status and mask-wearing behaviors in public settings during the first wave of COVID-19 among community residents in Yogyakarta, Indonesia. Outreach health checkups and self-report questionnaires were cross-sectionally conducted to measure for mask-wearing behavior, T2D status, and sociodemographic characteristics. Chi-square tests, bivariate, and multivariate logistic regression were performed for data analysis. Out of 254 total participants, nearly one forth (24%) of them were newly diagnosed with T2D, while 15% of them reported that they had ever been diagnosed as T2D before. There were no statistically significant associations between mask-wearing behavior and T2D status in bivariate and multivariate logistic regression models. However, Chi-square test results showed significant differences (P=0.02) in percentages of inconsistent mask-wearing behavior among those who were newly diagnosed as T2D (19.4%), those who had known as T2D (7.9%), and those who had no T2D (7.1%). This discrepancy in the results suggests the need for further investigations using larger sample size and more representative community samples to examine the associations between mask-wearing behaviors and T2D. Early diagnostic services and the awareness education for T2D is imperative to reduce the disease severity and mortality for future pandemic particularly among undiagnosed individuals who are unaware of their T2D status,