Data were collected on samples of American (N = 172) and Scottish (N = 264) adolescents to evaluate the scale reliability and construct validity of an adolescent version of Levant et al.’s (1992) Male Role Norms Inventory. Results indicate that the MRNI-A showed good overall internal consistency for the scale as a whole in both samples; results for the subscales were less robust. Convergent and discriminant validity were assessed with the U.S. sample. Results indicated adequate convergent validity for the MRNI-A for both boys and girls, and adequate discriminant validity for girls. Results for the discriminant validity of the MRNI-A for boys were not as conclusive. Consistent with research on adults, females in both samples endorsed less traditional views of masculinity than did males. Scottish adolescents endorsed less traditional views of masculinity than did Americans.