Associations among parenting styles, parental authority beliefs, and adolescent-parent conflict were examined in 426 mothers of middle adolescents from 3 cities in Iran. Consistent with past research, mothers judged parental authority as less legitimate for personal than for conventional or prudential issues. Poorer, less educated mothers were more authoritarian in their parenting, and more authoritarian and less authoritative parenting and poorer maternal mental health were uniquely associated with more frequent and more intense conflicts. Conflicts were more frequent among mothers who evaluated parental authority as less legitimate for prudential issues and more legitimate for personal issues, particularly among mothers of boys. Despite broad variation in mothers' education and social class, conflicts reflected concerns about drawing boundaries between mothers' legitimate authority and adolescents' personal jurisdiction. (Contains 3 tables.)