The present study aimed at investigating the pressing issue of the reasons why teachers leave government secondary schools of SNNPRS and the factors that contributed to the high teacher turnover. It was also intended to identify strategies for reducing turnover and increasing retention. To this end, answers to basic questions pertaining to trend and cost of turnover, initial commitment, major causes of turnover, and future intention of practicing and former teachers were sought. The study revealed that average teacher turnover in secondary schools per annum (20002/3- 2006/7) for the region was 13.7%; the highest (26.1%) being in Amaro special woreda and the lowest (6.9%) in Yirgalem. Out of the total leavers, (81.8. %) were male teachers. Finally the study has identified the consequences of teacher turnover and suggestions have been forwarded to reduce turnover, enhance retention and attract the best recruits to teacher education programs.