This study focused on the Impact of Supervision on the Management of Secondary Schools in North-East Geo-Political Zone, Nigeria. Ten (10) research questions were raised and ten (10) null hypotheses were postulated to find out the significant difference in the opinions of three categories of respondents. Descriptive survey method was adopted for the investigation. Population of the study was 120 supervisors, 826 principals and 16,160 teachers in the North-East Geo-Political Zone of Nigeria. Sample of 108 supervisors, 162 principals and 810 teachers were obtained through random sampling techniques. The questionnaires on Impact of Supervision on the Management of Secondary Schools in North-East Geo-Political Zone, Nigeria as a basic instrument was vetted by the supervisors and other experts in Education Administration and Planning at Ahmadu Bello University Zaria. It was subjected to pilot study in some schools which were not included in this study. Research questions were answered using mean and standard deviation. To analyze the data collected, Analysis of Variance (ANOVA) was used to test the hypotheses formulated at 0.05 significant level. All ten (10) null hypotheses were rejected which means there were significant differences in the opinions of the respondents on impact of supervision on the management of secondary schools in North-East Geo-Political Zone, Nigeria. The major findings of the study indicated that, medical service, accommodation, funding, communication, recreational facilities were available but not adequate in schools in the North-east zone. Recommendations such as the need to improve fund allocation to schools for proper maintenance of teaching and learning facilities and teacher training programme resuscitated were made. Finally, suggestions were also made for further study into the area of supervision, for the purpose of generalization and comparison, in other geo-political zones in Nigeria