The research was carried out in four secondary schools, two with a peer support system and two without, and involved a total of 931 pupils (49.5% males and 50.5% females). Participants were aged between 11 and 15 years of age, mean age 12.8 years. The aims were: to compare the perceptions of safety on the part of older and younger pupils in secondary schools with and without a system of peer support in place; to find out if there are differences in perceptions of safety within peer support schools on the part of those who are aware of the existence of a peer support service in their school and those who are not aware; and to find out if pupils in peer support schools are more likely to tell someone about school violence and bullying than those in schools without peer support. The results indicate very little difference between pupil perceptions of safety in schools with and schools without a peer support system in place. In fact, older pupils in the schools without peer support responded that they felt safer than pupils in schools with a peer support system in toilets and lessons. However, within the peer support schools there were significant differences in perceptions of safety between the substantial minority of pupils who were unaware that their school had a peer support system and those who were aware of it. The pupils who were aware felt safer in lessons, perceived school as a friendlier place to be, and worried significantly less about being bullied in comparison with those who were unaware. They were also much more likely to tell someone when bad things happened at school. The results are discussed in the light of previous research in the field and some recommendations are made for the practice of peer support. (Contains 2 tables.)