Instructional materials provide learners with real learning experience. Learners are usually interested in concrete experiences rather than mere talk and chalk mechanism. This study investigated effective utilization of instructional materials in teaching Upper Basic Social Studies in Kwara State, Nigeria. The study adopted the descriptive research design. Purposive sampling technique was employed to sample 235 Social Studies teachers. Data collected were analysed using percentage and means to answer three research questions. The results of the findings showed that many instructional materials were available at different percentage. Social Studies teachers use some instructional materials in the teaching of the subject. Teachers' disposition enhances their use of instructional materials. Based on these findings, it was recommended among others that the school administrators should boost the morale of teachers by providing necessary instructional materials needed to achieve instructional objectives. Teachers should also be resourceful as that could motivate students to learn and perform better in their study.