The aim of the present study was to examine the association between post-traumatic stress disorder (PTSD) and adult attachment in a young adult population. A sample of 328 Danish students (mean age 29.2 years) from four different schools of intermediate education level were studied by the Harvard Trauma Questionnaire (HTQ), the Revised Adult Attachment Scale (RAAS), the Trauma Symptom Checklist (TSC), the Crisis Support Scale (CSS), the Coping Style Questionnaire (CSQ), and the World Assumption Scale (WAS). Attachment styles were associated with number of PTSD symptoms, negative affectivity, somatization, emotional coping, attributions, and social support. The distribution of attachment styles in relation to PTSD symptoms could be conceived as uni-dimensional.