The need to improve the teaching and learning of Business Studies in secondary schools necessitated this study to assess the adequacy, availability and extent of utilization of instructional materials in the teaching and learning of Business Studies in secondary schools in Anambra State. Three research questions guided the study. The population of the study comprised 305 business studies teachers from 257 public secondary schools in Anambra State. Purposive and Cluster sampling were used to select 85 Secondary schools and 120 Business Studies teachers respectively. Instruments for data collection were standardized checklist and structure questionnaire. The checklist was used by the researchers to assess the adequacy of the instructional materials used in the teaching of business studies while the structured questionnaire was used to determine the availability and extent of utilization of instructional materials in the teaching of business studies. The questionnaire was validated by five experts with a reliability coefficient of 0.86. Data collected were analysed using Frequency, Percentage, Mean and Standard Deviation. Findings from the study revealed that instructional materials required in the teaching of Business Studies in secondary schools were not adequately provided. Also, that most of the instructional materials were available but not adequate and they were lowly utilized. Based on the findings of the study, it was recommended among others that government and philanthropists should support public secondary schools and made available, adequate number of the instructional materials needed for effective teaching and learning of business studies. Key Words – assessment; adequacy; availability; utilization; instructional materials; business studies