Whilst new friendships and an active social life are commonly discussed features of 'being a student', there is limited empirical research that has quantitatively studied the contribution that social factors play in students' university experience. Research that has been conducted shows that belonging and social integration are important factors in successful transition to university, and subsequent retention. This article presents research into students' social relationships at university, their attachment to the university, and how these elements link to university adjustment. Undergraduates (N = 135) completed questionnaires measuring their attachment to university peers, attachment to the university, experiences of problematic peer relationships and quality of adjustment to university life. Students who reported strong attachment to their peers also demonstrated higher levels of adjustment to university life and attachment to their university. Students who reported difficulties in their relationships with other students had lower levels of peer attachment and university adjustment. Attachment to university peers was the strongest predictor of university adjustment, followed by attachment to the university. The research highlights the role of social relationships in institutional belonging, and the importance of nurturing peer relationships and institutional affiliation to create a positive student experience.