The study provides a holistic view of how staff development can affect organizational effectiveness. The specific objective is to determine the relationship between staff development and organizational effectiveness. Social exchange theory was adopted as the baseline theory for the study, while extant literature was reviewed to ascertain the relationship between the study variables. Findings revealed that employee development in the organization exerts a great influence on the operations of the organization, and as such organizational management should invest in employee development to stem employee turnover and improve productivity. The study further recommends that organizations should ensure their employees are given adequate support for development.