Relationships among attachment to each parent, children's social self-efficacy, and the quality of peer relations (attachment to peers and perceptions of victimization) were explored with 67 fifth and sixth graders (31 female) attending a rural elementary school. Results of hierarchical multiple regression analyses revealed main effects for gender and attachment to mother relative to the attachment to peers variable, with girls and more securely attached children reporting higher quality attachment to peers. Main effects were also detected for gender and attachment to father relative to social self-efficacy, with girls and more securely attached children exhibiting higher self-efficacy. No main effects were observed relative to the peer victimization variable. None of the interaction effects involving gender and attachment to each parent relative to attachment to peers, peer victimization, and social self-efficacy were significant. Finally, evidence for mediation of attachment to father on attachment to peers by children's social self-efficacy was revealed. Implications of the results are discussed and ideas for future research are provided. Copyright # 2003 John Wiley & Sons, Ltd.Key words: attachment in middle-childhood; peer relationships; social self-efficacy One of the basic tenets of attachment theory suggests that early attachment relationships with primary caregivers influence the quality of children's future relationships with their peers. An abundant literature now provides extensive empirical support for associations between attachment to caregivers and the nature of peer relationships during the toddler through the elementary school years