Although there is no generally accepted definition of school climate and a single position on its dimensions, most authors agree that school climate is a multidimensional and complex construct, which refers to the quality and character of school life. Educational reforms that want to improve the quality of learning, but also improve the educational effect of the school, should not ignore that the school climate is one of the most researched school phenomena that affects the behavior and life of all participants in school life. In addition to the definition of school climate and other terms that conceptually overlap with school climate or other aspects of school life, it is necessary to define school climate and classroom climate. In contrast to school climate, classroom climate refers to social interactions in the classroom, student expectations for behavior, and school performance, but also to the physical characteristics of the classroom or the “intellectual, social, emotional, and physical environment in which students learn”. Classroom climate refers to the perception of the classroom environment, and school climate refers to the perception of the entire school. Classroom climate affects the perception of school climate as a more comprehensive phenomenon. The school climate’s perception depends on individual factors and the classroom climate. Teachers are the ones who represent one of the main factors in shaping students school experiences. A study conducted by Hallinan (2008) indicated that the teacher-student relationship predicts student commitment to school. Two special dimensions of that relationship are social and emotional support for students and teachers expectations of students. Students and teachers perceive the school climate more favorably when they feel safe and when aggression and victimization are not frequent. Students who feel safe at school are better adjusted, exhibit less delinquent and aggressive behavior, and report higher self-esteem. By improving the school climate, and especially the relationship between teachers and students, by establishing fair rules in the school and respecting diversity, the students behavioral, cognitive, and emotional engagement in school is affected, which further affects various areas of the student’s life, such as student well-being or and their academic achievement.