This study aims at investigating secondary school students knowledge of and attitudes towards environment on different variables. The study was conducted with 385 secondary school students through the descriptive survey model. 'Environmental Knowledge Test' and 'Environmental Attitude Scale' were used to collect data for the study. The results showed that secondary school students knowledge of and attitudes towards environment did not differ on gender and father education level but they differed significantly on grade level. In addition, it is concluded that environmental knowledge levels varied with mother education level and also levels of attitudes towards environment differed on levels of curiosity towards environment. Finally, some suggestions based on results were included in the study.