This study entitled “Impact of teachers turnover and retention on academic performance in Rwandan public secondary school’’ four objectives of finding out the factors impeding teachers retention, to find out how poor teachers’ retention affects students’ academic performance, to examine the influential factors of teachers retention and to determine how teacher retention impacts students’ academic performance, was done in four secondary schools operating in Gatsibo District that are: ESIM Kiramuruzi, ES Nyakayaga, College Baptiste de Ngarama (COBANGA) and Gabiro High School. The study employed Documentation, questionnaires and interviewing people in order to get real information on the field.In this work, the research designs are used, and the researcher randomly questioned 60 respondents as the sample size, where targeted population was 850 as total target population from the above mentioned schools. Both primary and secondary data sources were used to collect data. Primary data were obtained by questioning and interviewing respondent, then secondary data were obtained through documentation. Collected data were analyzed by using frequencies and percentages.The researcher found that teachers retention is very important to ensure students’ academic performance as stated by respondents. Findings based on objectives where collected through questioning and interviewing respondents on the field.By conclusion, the research found the causes of teachers turnover, the factors of teacher retention and the effects of retaining teachers on students’ academic performance; teacher’ retention is only possible through building their professional capacities and providing both intrinsic and extrinsic motivation. Suggestions and recommendations were provided for the further research.