This study investigated the effects of disaster management towards academic achievement in public secondary schools in Arusha District Council, Tanzania. Objectives were to; examine ways of managing disasters in secondary schools and effects of disaster management towards academic achievement of students in public secondary schools. Emergency Management Theory guided the study. Convergent mixed methods design was adopted. Questionnaires, documentary analysis, photo taking and interviews were used to collect data from 105students and 85teachers selected by simple and stratified random sampling techniques. Five school heads and 4 WEOs were purposively selected. Validity was fortified through expert inputs. Reliability employed test-retest technique and reliability index, SQ r=0.735, TQ r=0.827and NTSQ r= 0.761were obtained. Credibility and dependability of qualitative data was established through detailed reporting of the research process. Qualitative data underwent thematic analysis. Quantitative data were analysed using descriptive statistics in the SPSS version 23 and results were presented in tables. Findings include provision of fire extinguishers to help in putting off fire outbreaks, enhancing drainage system and raising building foundation to prevent surface runoff from accessing classrooms and offices. Proper use of fire extinguishers to minimize damages caused by fire in schools hence minimal interference to learning process. In conclusion, without a disaster management plan, schools spend more time and resources reacting to a situation instead of planning for the anticipated disaster. Recommendations entailed all institutions to provide fire extinguishers, enhance drainage system and improve students’ discipline as disaster mitigation measures.