The need for in-service education of teachers cannot be underestimated. It is a necessity in enhancing work performance and motivation of teachers in the field. Absence of in-service training of teachers will retard professional growth of teachers as well as "missing gaps" between demands and actual achievement levels. Inservice education allows for such activities that may include seminars, workshops, conferences, classes, exhibitions etc that are designed to develop and improve employees in an organization from the initial employment stage to retirement. From the foregoing, it becomes imperative that every attention should be devoted to the inservice education of teachers to promote their professional growth and development. Therefore, the focus of this paper is to have an overview and problems of in-service education of teachers in Nigeria. Finally, relevant suggestions were put forward to achieve a better staff development programme aimed at helping teachers to update their knowledge, expertise, skills and competence in the teaching profession.