The importance of stigma of help-seeking and social support in predicting the quality of therapeutic alliance among psychotherapy clients The aim of the research was to intent to predict the perceived quality of therapeutic alliance based on the perceived level of social stigma of help-seeking, self-stigma of help-seeking and social support in clients in psychotherapy. One hundred and forty-three clients of age 18-26 participated in the study. Most of the clients were female (n = 128), currently living and studying in Zagreb. The data was collected through an online survey which consisted of five questionnaires: General questionnaire, Working Alliance Inventory – short revised, Self-Stigma of Seeking Help Scale – Therapy, Perceptions of Stigmatization by Others for Seeking Help and The Multidimensional Scale of Perceived Social Support. It was confirmed that the clients who perceived a higher degree of self-stigma were to some extent more likely to perceive a higher level of social stigma, lower friend support and lower quality of therapeutic alliance. A mild, significant, negative correlation was also found between social stigma and perceived level of friend support, but not its correlation with the quality of therapeutic alliance. Clients with a higher level of friend support were to some extent more likely to perceive better quality of the therapeutic alliance. The results of preliminary regression analysis found self-stigma to be the only significant predictor of quality of therapeutic alliance. It is recommended to validate the translated instruments and to further investigate the phenomena due to the possible relevant applications of findings to psychotherapy efficacy.