The study extends recent research on the link between attachment security and the sociocultural and psychological adaptation of immigrants. It was hypothesised that attachment style would moderate the effects of sociocultural adaptation difficulties on psychological distress and the relationship between attachment style and immigrant background variables was explored. The study was correlational and questionnaire-based, including a sample of 172 Brazilian immigrants living in the UK. According to the findings, secure and dismissing attachment styles moderated the effects of sociocultural adaptation difficulties on psychological distress. Preoccupied attachment style moderated the effects of previous immigration experience on psychological distress and the effects of duration of stay in the UK on concerns over terrorism. Future studies should employ longitudinal designs and include a variety of immigrant groups.