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The present study aimed at investigating the relationship between dream structure, the concept of boundary structure, and the Big Five personality dimensions. Dream structure was assessed with the recently developed Düsseldorf Dream Inventory, which is based on a factorial assessment of dream structure. Dream structure was correlated with boundary structure (Boundary Questionnaire) and personality dimensions (Big Five Inventory) in 1,958 participants in an online study. The results show that boundary structure, openness to experience and neuroticism were associated with dream structure. Participants with thin boundaries had a higher dream recall frequency (DRF), considered their dreams to be personally more significant, exhibited more bizarre and aversive dreams, and more incorporation of elements from waking life. Openness to experience was positively correlated with DRF and personal significance of dreams. Neuroticism was correlated positively with aversive dreams, more incorporation from waking life, and personal significance of dreams. The present results confirm previous correlations between dream structure and personality and identify dream structures that are relevant for these associations.