The study investigated the effects of study habit on the academic performance of students’using some selected senior secondary schools in Ijebu-Ode Local Government Area of Ogun State as a case study. Two hundred (200) students were randomly selected from five senior secondary schools in the area. The instrument utilized for the study was a questionnaire named “Study Habit and Study Attitude Scale”(SHSAS). Four hypotheses were tested and the result showed that family background, peer group pressure, personality type of the student and the school environment all affect the reading habit of students in secondary schools. Data was analyzed using percentage. Based on the findings, appropriate parental counseling programme needs to be organized for parents that will educate them on how to motivate their wards to cultivate good study habits in order to enhance their academic performance. Hence, it is suggested that similar research with relevant research methodology should be used in carrying out research in other states of the federation to ascertain the degree of conformity which this research have on the study habit of all senior secondary school students in Nigeria.