The COVID-19 pandemic has negatively impacted adults' mental health around the world. Various studies highlighted the role of socio-demographic risk factors, including age, gender, and level of education, in increasing this impact. Although insecure attachment styles are considered a vulnerability factor for psychopathology and difficulties in coping with stressful situations, few studies have examined the role of attachment styles in relation to psychological responses to the COVID-19 pandemic.This study aims to investigate the role of attachment styles in af-fecting psychopathological problems and post-traumatic symp-toms during the COVID-19 pandemic in a sample of Italian adults (N=1548). During the first lockdown in Italy, the Attachment Style Questionnaire, the Impact of Event Scale-Revised, and Symptom Checklist 90-Revised were administered to the participants to assess attachment styles, trauma-related symptoms, and psychopathological problems. The results showed that 41% of the participants had symptoms of clinical and subclinical relevance during the pandemic. Anxious and avoidant insecure attachment styles predicted psychopathological problems and post-traumatic symptoms, whereas secure attachment style was a protective factor. Our results highlighted the significant role played by the quality of attachment styles on adult mental health during the pandemic, providing valuable elements for targeted psychological support interventions.