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Different studies have shown that students perform poorly in English grammar. Thus, the study investigated the effect of Library and Information Science Integrated Language Teaching Approach on students’ achievement in English grammar. The achievement of students taught with ILTA were compared with those of students taught with the Form Based Approach (FAB). A quasi-experimental design was adopted. A total of 296 senior secondary school two students (83 males and 73 females) constituted the sample. They were assigned into experimental and control groups using a multi-stage sampling technique. The English Grammar Achievement Test (EGAT) was used for data collection. Treatment lasted for six weeks. The research question was answered using mean scores, while Analysis of Covariance (ANCOVA) was used to test the null hypothesis at 0.05 level of significance. The result showed that Library and Information Science Integrated Language Teaching Approach significantly improved students’ achievement in English grammar, but gender did not significantly influence students’ achievement and interest in English grammar. There was also no significant interaction influence of instructional approaches and gender on students’ achievement in English grammar. It was recommended that education stakeholders should organize workshops to educate teachers on the efficacy of Library and Information Science Integrated Language Teaching Approach as well as the procedures for using it in teaching English grammar, especially to learners of English as a second language.