INTRODUCTION: Discrimination experiences may be a contributing factor to the elevated prevalence of mental health problems among adults experiencing homelessness. METHODS: Using survey data (N = 552) collected from adults seeking services at an urban day shelter, the relationships between everyday and major discrimination experiences, distress tolerance, and mental health problems (depression, anxiety, post-traumatic stress disorder, poor mental health days) were characterized. Distress tolerance was examined as a moderator of the relationship between discrimination and mental health problems. RESULTS: Participants were predominantly from racially minoritized groups (59.6%), non-Hispanic (88.7%), and male (70.9%), with an average age of 45.7 years old (SD = 11.7). Descriptive analyses indicated that the main reason for discrimination differed between racially privileged (i.e., White participants) and racially minoritized participants (i.e., participants who identified as Black, American Indian/Alaska Native, Asian, Native Hawaiian/Pacific Islander, or multi-race), such that homelessness was most commonly endorsed among racially privileged participants while racial discrimination was most commonly reported among racially minoritized participants. Multivariate logistic regression analyses revealed associations between everyday discrimination, major discrimination, and distress tolerance with mental health problems. Distress tolerance did not moderate the relations between discrimination and mental health problems in most analyses. Notably, major discrimination was no longer associated with all mental health variables when both everyday and major discrimination were included in all models. CONCLUSION: Findings suggest that reducing everyday discrimination and addressing the adverse impact of everyday discrimination experiences may have a beneficial impact on mental health.