A Dissertation submitted in Fulfilment of the Requirements for the Degree of MSc. Human Resource Management of Mzumbe University.ABSTRACT The objective of the study was to investigate factors influencing labour turnover in the private sector in particular production department of Serengeti Breweries Limited. The study specifically investigated on staff retention measures utilized by the management, whether exit interviews are conducted, and the competitiveness of reward program and whether the conduciveness of the work place environment as factors that may contribute to workforce turnover in this sector. The study adopted a descriptive research design to identify the employee turnover factors and a sample size of 60 employees were selected using a simple random sampling since the population for the purpose of this study was regarded as homogeneous. The study collected both primary and secondary data using questionnaire, observation and review of empirical and theoretical literatures respectively. Statistical software excel was used for data analysis and generation of charts and graphs. Analysis took both descriptive and inferential dimensions were employed respectively. The study revealed that company lacked effective staff retention strategies, where exit interviews were not regularly and effectively conducted, the employed reward program was not competitive and existence of unfriendly work place environment influenced most employees to leave the organization. Thus it was concluded that lack of effective strategies to manage these factors influenced most companies to continue experiencing high staff turnover rates that lower the total organization productivity and increase running costs by recurrent recruitment costs, production disrupting and broken clients relationships.