ABSTRACTThis study describes the distribution, nature, pattern, and magnitude of sex differences in self‐report delinquency. A national probability sample of 1725 youths, ages 11‐17, was interviewed using a comprehensive measure of self‐report delinquency including serious and violent crimes. Major findings include (1) small but consistent sex differences in numerous delinquent behaviors and in most types of delinquent behavior due to higher offense frequencies of males and greater numbers of male offenders, (2) generally similar patterns of male and female delinquency (r = .82), (3) sex differences in the proportion of high‐frequency offenders, (4) few interaction effects of sex with other demographic variables, and (5) stable sex differences in certain delinquent acts across a