This study focused on the effect of employee training and development on public institution performance case of National Itorero Commission. The general objective of this research was to determine the effect of employee training and development on public institution performance where specifically the study had to find out the extent to which training and development policies effect on NIC performance, to establish the effect of evaluation of training and development on NIC performance, to identify the training and development challenges that effect the performance of NIC and to establish the contribution of employee training and development on the performance of NIC . This study adopted a descriptive type of research design which has set out to describe how employee training and development contribute on the performance of NIC and the target population which is also the sample size because it is a small number, the staff on NIC working at the headquarters and others working at district level. The questionnaire was used for gathering data. The validity of the questionnaire has been tested with the aid of the supervisor, research experts knowledgeable about the themes of the study. The results of this study was obtained by using regression analysis indicated that a well-designed training and development policy, training and development evaluation well done and training and development challenges handled have a positive effect on NIC performance. The findings revealed a positive and significant effect of employee training and development evaluation on NIC. This indicate that if employee training and development evaluation is well done after training it will effect NIC performance where (r=0.986<0.01), it means that 98.6%, and the findings revealed a positive and significant effect of training and development challenges. This implies that if challenges in implementing employee trainings and development towards employees are well treated and handled in favor of increasing knowledge and skills of employees it will be an increase of NIC performance (r=0.996<0.01 which means 99.6%. Then the results indicate that employee training and development has a positive and significant contribution on the performance of NIC(r=0.997<0.01) which means 99.7%. This study recommends NIC to continue using an employee training and development policy which can guide it during training process; and should conduct a need assessment regularly for being aware of employee weaknesses and prepare training and development which can contribute on employees and NIC performance will be efficient.