This study focuses on the impact of training and development on employee’s job performance in Nigeria. Training and development is a critical process, which seeks to improve the performance of workers in an organization. The study defined the concept of staff training and development; it identified stages in organizing staff training and development such as orientation, in service programme, job rotation and in-house training. The study establishes the importance of staff training and development in organizations which include rapid economic development, promotion of political stability and poverty alleviation. The challenges of staff training and development are poor political leadership and poor staff training. In conclusion, training has been invaluable in increasing productivity of organizations. It does not only enhance employees resourcefully, but also provides them with an opportunity to virtually learn their jobs and perform more competently. It is recommended that training programmes of the organization should be on a continuous basis and not only when the organization is confronted with difficulties.