--- - |2 This study examined infant attachment as a predictor of social information processing (SIP) in middle childhood (n = 82) while controlling for parental sensitivity in middle childhood. Attachment quality was assessed using the Strange Situation. Although attachment insecurity did not predict SIP, attachment disorganization positively predicted the early SIP steps of hostile attributional bias and aggressive goals. Children with disorganized attachments interpreted ambiguous provocations more negatively (as indicating more hostility, rejection, and disrespect and as resulting in more anger) and endorsed significantly more revenge and dominance goals than children with organized attachments. In contrast, parental sensitivity negatively predicted the later SIP step of positive expectations for aggressive responses. Results further our understanding of the adverse outcomes associated with attachment disorganization. - Child Development, EarlyView.