PurposeRefugees are at greater risk of mental illness due to stressors encountered post-resettlement. However, few longitudinal studies have examined the within-person effects of these stressors, especially with respect to social integration. This study aims to examine what factors are associated with psychological distress in a longitudinal sample of refugees resettled in Australia.MethodsThis study used data from three Waves of the Building a New Life in Australia study, collected between 2013 and 2018. The eligible sample included 1881 adult respondents, clustered in 1175 households. We conducted multilevel mixed-effects growth modelling incorporating time-variant and time-invariant covariates with psychological distress, using the Kessler Psychological Distress Scale (K6).ResultsRates of high psychological distress increased across the 5-year follow-up period. Social integration stressors (e.g. discrimination, lower sense of belonging, loneliness, lower English proficiency) were associated with higher levels of psychological distress over time. Refugees reporting loneliness not only had a greater risk of elevated psychological distress at each time point, but the difference in risk increased over each time point. Refugees who were exposed to traumatic events, older, female and of Middle Eastern background were also more likely to report higher levels of psychological distress over time.ConclusionsThese findings highlight the importance of identifying refugees who may encounter difficulties with social integration in the early years of resettlement. Newly arrived refugees may benefit from longer-term resettlement programmes that address post-migratory stressors, particularly with regards to loneliness, to reduce the prevalence of elevated psychological distress during the early years of resettlement.