--- - |2 The positive influence of social support on psychological wellbeing is well documented but the research among young adults is scarce. Additionally, it is still unclear what type of social support explains the positive influence in this age group. Alexithymia has been linked to lacking social support and higher levels of psychological distress, but the underlying mechanisms are not well known. We aimed to assess the association of social support and alexithymia with psychological distress in a sample of young adults. The non‐clinical sample comprised 316 young Finnish adults (mean age 23 years). Psychological distress was assessed using the 12‐item General Health Questionnaire (GHQ‐12), alexithymia was measured with the Toronto Alexithymia Scale (TAS‐20) and social support with the Multidimensional Scale of Perceived Social Support (MSPSS). The associations were assessed using regression analyses. The TAS‐20 (p = 0.002) and MSPSS (p = < 0.001) total scores were significantly associated with the GHQ‐12 scores even after adjustment for sociodemographic variables. For the model with the TAS‐20 and MSPSS subscales, the Difficulty Identifying Feelings subscale score of the TAS‐20 scale (p < 0.001) and the Family subscale score of the MSPSS scale (p = 0.010) were significantly associated with the GHQ‐12 scores. Our results show that low social support and high levels of alexithymia are associated with increased psychological distress both in females and males. Perceived social support from family explained the association between social support and psychological distress to a significant extent. Regarding alexithymia, the association with psychological distress was mainly related to difficulties identifying feelings. - Scandinavian Journal of Psychology, EarlyView.