The study examined the management practices of Academic Heads of Departments for teaching improvement in South-South Nigerian Universities. Two (2) research questions and two (2) hypotheses guided the study, which adopted the descriptive survey as the design. The population of the study comprised the 11 Federal and State universities in South-South, Nigeria that have Faculties of Education and with 1487 lecturers, 432 and 1055 from Federal and State universities respectively. A sample of 491 was drawn using the stratified random sampling technique. The respondents of the study responded to a validated 23 item instrument titled: Heads of Departments Management Practices for Teaching Improvement Scale (HDMPTIS) with a reliability index of 0.95. Mean scores were used in answering the research questions while z-test was used in testing the hypotheses at 0.05 alpha level. The findings of the study revealed among others that Academic Heads of Departments monitoring practices contribute to teaching improvements in South-South Nigerian universities by providing opportunities for university academic personnel to expand their teaching techniques and improve their teaching skills. Based on the findings of the study, it was concluded that the mentoring and supervisory practices of Academic Heads of Departments contribute to teaching improvement in South-South Nigerian universities. It was recommended among others that Academic Heads of Departments should continue to use appropriate administrative, academic, psychological, physical, social and environmental consideration in mentoring and supervision of staff for teaching and research.