<p>Migrants are often systematically exposed to ethnic microaggressions. It is important to understand the extent to which and how microaggressive experiences affect psychosocial processes in the process of interacting with the local population. In addition, understanding the demographic structures that determine this process will facilitate the handling of the problem as a whole. The aim of this study is to examine the mediating role of intolerance of uncertainty in the effect of ethnic microaggressions on minority stress among Syrian migrants, as well as the moderating effects of age and length of stay. The sample of the study, which was structured according to a cross-sectional design, consisted of 395 Syrian migrants, and the data were collected between January and February 2024. The effect of moderation and mediation was tested with the PROCESS macro (Model 5) for SPSS 23.0 by Hayes using 5000 bootstrap samples. Intolerance of uncertainty has a mediating effect on the relationship between ethnic microaggression and minority stress. Age moderated the relationship between ethnic microaggression and minority stress, while length of stay did not have a significant moderating effect on the same relationship. Excessive exposure to ethnic microaggressions may increase Syrian migrants’ intolerance to uncertainty and minority stress, and such psychosocial problems are at higher risk in older migrants.</p>