The aim of this research is to examine risk behaviour of students (adolescents) on the internet, i.e. which risk websites students visit most in their free time, and whether there are differences among students considering the type of school they attend (gymnasium, four-year high school and three-year high school). The research was carried out in the school year 2014/2015 in 18 high schools on a sample of 2,395 participants in Republic of Croatia (two counties). According to research results, students most often visit websites that reproduce movies and music and offer entire channels without having to pay any sort of fee. Websites where they can upload pictures and stories that might affect other people's reputation are the least visited. A difference in visiting risk websites considering the type of school students attend has also been confirmed. According to research results, there are no statistically significant differences among students considering the way they spend their free time and the amount of free time they spend on the internet. [Selected paper of the International Conference on Education (ICED) (4th, St. Petersburg, Russia, June 26-28, 2015).]