This study examined the perception of the university lecturers on the effectiveness of Closed-Circuit Television (CCTV) In teaching undergraduate students in large classes. One hundred lecturers randomly selected from University of Lagos, Nigeria constituted the sample for the study. The data generated through a self-designed questionnaire was analysed with the t-test and Analysis of Variance statistical procedures with significance fixed at 0.05. The results indicated among other things that sex, academic qualification, and years of experience had no Influence on the perception of the lecturers about the effectiveness of C.C.T.V as a technological tool for stimulating students' attention, and participation in large classes. On the basis of the findings, it was recommended that lecturers should be more interested in the utilization of the vast technological tools that can enhance effective teaching and learning In large classes. Universities' authorities should endeavour to provide technological devices, such as Closed-Circuit Television for all faculties for effective teaching in large classes.