180 adolescents, aged 11-12 years, and 180, aged 15-16 years, from one Scottish secondary school participated in this study. The purposes of the investigation were: to determine the most significant family member and unrelated person in young peoples' lives; and to identify which characteristics rendered these persons important. 'Mother' and '(same sex) friend' emerged as the outstanding choices. Family members (except siblings) were associated with positive characteristics, whilst amongst unrelated adults, youth group leaders were viewed positively. By contrast, school teachers were primarily seen as occupying a challenging role. Where age and sex differences were found, it was invariably those in early adolescence and females who were more likely to attribute positive characteristics. These results are discussed in relation to the concept of 'mentoring' and the role of mentors in adolescents' lives.