This book was designed to find out teachers'' perception of the influence of students'' indiscipline on academic performance in senior secondary schools in South-South, Nigeria.The study was a research work modified to come out as a book.The aim was to elicit information on what teachers in the South-South, Nigeria, perceived to be the influence of indiscipline of students on academic performance. The population that was used was 2100 teachers from 105 approved private and public senior secondary schools in the South-South, Nigeria. A simple random sampling technique was used to get 210 teachers for the study. The results of analysis show that a greater number of teachers (122) representing (58.10%) have the perception that students'' indiscipline could influence academic performance. Based on the findings, recommendations were made among which was that students must understand that they should be disciplined so as to perform well in their academics.