This study investigates similarities and differences in Lithuanian and Norwegian teacher practices aimed at preventing school bullying by applying a whole-school approach anti-bullying programme. The quantitative data was collected from 1576 teachers from 99 schools in Lithuania, and 82 teachers from 13 schools in Norway that have implemented the Olweus Bullying Prevention Programme (OBPP). The comparative analysis of the study results indicates that Norwegian teachers are slightly more active in working with the OBPP on the school and individual levels, as well as in working with the programme in general. The study reveals that female teachers are more active than male teachers on the classroom and individual levels of the OBPP as well as the whole programme, and that primary education teachers are more active than lower secondary education teachers on the classroom level of the OBPP. The implications of teacher practices aimed at preventing bullying by applying the OBPP are discussed, and limitations of the current study emphasised.