The present article presents the findings of a quantitative study which, beyond the general purpose of extending previous findings on the prevalence and nature of peer bullying in the secondary schools of a specific geographical area of Greece, had the aim to describe the problem from the points of view of students in their different roles as observers of bullying, students who are bullied and students who behave as bullies. A total of 502 students in the first three years of four different high schools were asked to fill in the Olweus Questionnaire. The results of the present study reveal that bullying does in fact exist in Greek secondary schools, primarily in the form of verbal aggression, social exclusion and sexual harassment. Of special interest is the variance in the frequency of bullying depending on whether the students identified themselves as bullies, victims, or observers.