A study was conducted to assess the environmental knowledge and attitude of secondary level students in Tangail sadar upazila of Tangail district during January to April, 2015. Three hundred students of class nine and ten grade were randomly selected from 10 different private and government schools. The data were collected using questionnaire survey method. Results of the study revealed that the level of environmental knowledge of the secondary level student was high. Their average knowledge level was 15.83 (±3.07) out of 20. They had positive attitude towards environment. The order of environmental knowledge and environmental attitude of the students group was Science> Commerce> Arts and Arts> Commerce> Science, respectively.Government school students had high attitude level than private schools. In case of gender of students there were no significant differences in environmental knowledge and attitude. Urban students had higher knowledge level and rural students had higher attitude level. Higher education of parents influenced the environmental awareness of students. About fifty percent students thought television was one of the most important sources of environmental awareness. The study concluded that a high level of understanding and positive attitude of students might be achieved from the families of respondents, teachers, media, private reading and school curriculums regarding the environment that increase the environmental view among students as well as in the society.