Reports on juvenile offending in New Zealand, examines the pattern of juvenile offending in a cohort of males as they move through the juvenile age range. The data used was obtained from a major longitudinal study with a sample of 25,000 boys born in 1957 who were attending New Zealand schools in 1967. Data included background characteristics of each sample member, a measure of social adjustment, and a measure of school performance. Follow-up information was gathered each time a boy in the sample appeared in the Children’s Court or was referred to the Youth Aid Section of the Police or the Psychological Service of the Department of Education. Results show that a considerable proportion of young New Zealand males come to notice for juvenile offending: 14% of the sample appeared in the Children’s Court at least once before age 17; 11% of non-Māori and 35% of Māori sample members appeared in Court by age 17 and had a charge or complaint concerning offending upheld against them. Of the sample members who appeared in Court once, 47% appeared a second time. More than 60% of the Māori boys and 40% of the non-Māori boys who appeared in the Children’s Court re-appear at least once before turning 17.