Dissertation (MA Education)The major focus of the current Tanzanian education reforms and restructuring of the education system is to improve academic performance. The fundamental goal has been to push up students’ academic performance. However, the big debate on the table is about what should be done to advance students’ achievement. This study examined the influence of collegiality and collaboration aspects of school culture on students’ achievement in government secondary schools, taking the case of Ubungo Municipality. The study employed mixed method approach. A sample of one hundred and two respondents (102) was selected. The data were obtained through questionnaires, focus group discussion, interviews and documentary review. SPSS version 21 and Microsoft Excel programs were used in data analysis and presentation. The study also found out that there is an influence of collegiality and collaboration aspects of school culture on students’ academic performance in government secondary schools. Also, the study revealed that staffs were not fully involved in making a decision, which is an important aspect that missing in schools. It was again found that teachers, parental involvement in schools’ decision making needs more improvement. The findings indicated further that the some heads of schools were not given any kind of motivation and encouragement to both teachers and students. The study findings have recommended that school administration should create various students and teachers motivation systems that will fully motivate and encourage them to their level best. Enough learning resources should be provided to government schools within the municipality to improve academic performance.