The study investigated cost management for the administration of secondary schools in Rivers State. Two research questions and two hypotheses guided the study. The design used for the study was descriptive survey. The population of the study comprised 253 secondary school principals while the sample of the study was 200 principals (79%) who were sampled for the study using stratified random sampling technique. The instrument used for data collection was questionnaire titled “Cost Management for Administration of Secondary Schools Questionnaire” (CMASSQ). The questionnaire was validated by two experts (one expert in the Department of Educational Management and one expert in the Department of Psychology, Guidance and Counselling), University of Port Harcourt. Pearson Product Moment Correlation co-efficient was used to estimate the reliability of the instrument with an index of 0.82. The questionnaire was personally administered by the researcher. Research questions were answered using mean and standard deviation while the hypotheses were tested using z-test at 0.05 level of significance. The findings of the study showed that accounting information techniques affects the administration of these schools and adequate financial records are adequately kept for the administration of the school. It was recommended that school administrators should be trained on modern and technological cost management techniques for the administration of secondary schools in Rivers State.