Non-suicidal self-injury (NSSI) is a destructive behaviour engaged in by a large proportion of youth and young adults in current society. Despite previous work, the recent revision of the DSM does not include NSSI as a distinct syndrome; instead it remains in a category for disorders requiring additional research. Thus, in order to better understand the many etiological components underlying NSSI behaviour, still more investigation is required. To this end the current investigations aimed to further elaborate upon known links between NSSI behaviour and parent-child relationships from two perspectives: first, with regard to the overall quality of relationships with parents, and second, with specific focus on the impact of attachment representations of early relationships with parents. Though both perspectives have been investigated in the past, the current studies were developed to alleviate methodological limitations of the existing literature. Study 1 adopted a person-centered approach to examine patterns of perceived relationship quality reported by self-injuring youth based on the combination of multiple relational characteristics; these patterns were then compared with several indices related to different manifestations of NSSI behaviour. Results show heterogeneity in the perceptions of parent-child relationship quality in self-injurers, such that both negative and positive family backgrounds were implicated in the behaviour. Further analyses demonstrate that the level of risk presented by a self-injuring individual can be differentiated based on perceived quality of parent-child relationship. Study 2 investigated how individuals’ internalized states of mind regarding early attachment experiences are related to NSSI, with particular attention dedicated to the relative influences of child maltreatment and attachment representation. Attachment representations reflecting deficits in emotion regulation (preoccupied, unresolved/cannot classify) were most common in self-injurers. Moreover, self-reported childhood maltreatment and attachment states of mind independently contributed to the prediction of NSSI. Lastly, findings suggest that distinct relational influences characteristic of relationships with mothers and fathers are associated with NSSI. The two studies presented here significantly contribute to existing knowledge concerning parental influences in the etiology of NSSI. These investigations add to existing knowledge of NSSI, and may ultimately aid in preventing and treating this damaging behaviour.