The study was on the Impact of School Facilities on Students' Academic Performances in Public secondary schools in Zaria and Giwa Education Zones in Kaduna State, Nigeria. The study was conducted with the objectives among others to: determine the Impact of Teaching Facilities, Learning Facilities, Welfare Facilities, Health Facilities on Students' Performances in Public Secondary Schools in Giwa and Zaria Education Zones in Kaduna State. In line with the stated objectives, five research questions and five null hypotheses were formulated for the study. The study adopted the use of descriptive survey research design and out of the total population of 2093, 628 copies of questionnaire were administered, but only 600 were correctly filled and returned, consisting of24 principals and 576 teachers. The instrument tagged, ?School Facilities on Students Academic Performance Questionnaire,(SFSAPQ) in Public Secondary Schools In Giwa and Zaria Education Zones Questionnaire? was used to collect data from respondents. This instrument was validated and pilot tested and a reliability index of 0.85 was obtained.Data gathered were analysed using t-test at 0.05 level of significance. Findings of the study among others revealed that there is no significant difference in the opinions of teachers and principals on the impact of teaching facilities on students' academic performance in Public Secondary Schools in Giwa and Zaria Education Zones in Kaduna State. Also, finding shows thatthere is no significant difference in the view of respondents on the impact of welfare/health facilities on students' academic performances in secondary schools in Giwa and Zaria Education Zones in Kaduna State. In view of the findings, it was concluded that school facilities remain one essential factor in the realization of the goals of secondary education. The researcher recommendend that: government and school managers should make effort to provide teaching and learning facilities such as chairs, tables, laboratories, computers/ICT, and classrooms in Public secondary schools in Giwa and Zaria Education Zones in Kaduna State, Nigeria.