The purpose of this study was to examine the predictive level of teachers' communuciation competencies and perceptions of school climate for loneliness at school. Structural equaition modelling and the method of convenience sampling were used in the study. The participants of this study consisted of 172 primary school teachers and 213 middle school teachers, in total, 385 teachers. These are teachers who worked at primary or middle schools located in Düzce, Turkey and its five districts. The results revealed that teachers' communication competencies had a direct effect on their perceptions of loneliness at school and it had an indirect effect on their prceptions of loneliness at school through school climate. Communication competencies had a high level of effect on loneliness at work: while three-fourths of this effect was a direct effect, one,fourth of it was explanied through school climate. The model depicts79% of the variance of loneliness at school.