The relationship of teachers' professional commitment and school climaternin Jimma zone government high schools was investigated in a sample ofrn153 teachers of eleven secondary schools. Two kinds of questionnaires,rnwhich focused on the three dimensions of school climate (collegialrnleadership, teachers' professionalism and academic press) and teachers'rncommitment were administered. The Cronbach alpha estimate of reliabilityrnof the instruments ranged from 0.81 to 0.95 for school climate scales and itrnwas 0.93 for teachers' commitment scale. Teachers' commitment andrnschool climate were found to be significantly related to each other. Amongrnthe components of school climate, teachers' professionalism was found tornhave the highest relationship with teachers' commitment. Collegialrnleadership, on the other hand, has relatively low but significantrnrelationship with teachers ' professional commitment. Multiple regresswnrnanalyses revealed that components of school climate could predictrncommitment of teachers in the school. ANOVA results showed that there isrnsignificant difference of commitment across teaching work experience withrncommitment of teachers increasing with experience. Discussions andrnconclusions are made based on the results. Finally, somernrecommendations are indicated for possible interventions and furtherrnstudy