Background: Lay attitudes are often seen as potential barriers to mental health recovery. But apart from perceiving them as potential barriers, they can also play an important role in stimulating individuals to consult (in)formal help sources, in particular through the process of help referral. Where existing research mainly focusses on actual help seeking behaviour, this study will focus on lay publics’ referral behaviour. Aims: This study analyses the relation between causal beliefs and stigmatising attitudes and social distance on the one hand, and (in)formal help seeking recommendations on the other. Methods: Data from a survey carried out in 2019, assessing the attitudes of Public Health Insurance Provider (HIP) members towards mental health problems, was used. Part of the survey questions was based on a quantitative quasi-experimental design, using hypothetical written vignettes. The weighted data represent a sample of the adult Flemish population (22–94 years, N = 5675). Multiple linear regression analysis was used to examine the relation between causal beliefs and stigma, while binominal logistic regression analysis was used to investigate the relation between causal beliefs and help seeking recommendations. Results: The results reveal that causal beliefs significantly associate with stigma, measured by stigmatising attitudes and social distance: personal- or biogenetic beliefs associate with more stigma, where psychosocial beliefs associate with less stigma. Concerning help seeking recommendations, psychosocial beliefs associate with recommending psychological or psychotherapeutic care, biogenetic beliefs associate with advising help from general practitioners and suggesting psychiatric help, while personal beliefs negatively associate with recommending formal help. Meanwhile, biogenetic beliefs associate with less informal help seeking recommendations (e.g. family, friends and online self-help), where personal beliefs associate with more informal help seeking recommendations and psychosocial beliefs only associate with online help referral. Conclusion: This study highlights the importance of causal beliefs in affecting public stigma and help seeking recommendations.