The purpose of this study was to investigate into influence of neighbourhood and parenting style on study habit among adolescents in Ibadan North Local Government Area of Oyo State, Nigeria. Descriptive research design was used in the study. One hundred and eighty seven (187) participants constituted the study’s sample. Both the independent and dependent variables were measured with relevant standardized instruments and the data obtained was analyzed using Pearson Product Moment Correlation and Multiple Regression statistical method. Three research questions were raised and answered. The result showed that students’ study habit is correlated with neighbourhood (r = .847; p<.05); and parenting styles (r = .780; p<.05), independent variables when pulled together have significant contribution to students’ study habit (R adjusted =.749 & R2 adjusted =.701) and each of the independent variables made a significant contribution to the prediction of students’ study habit. In term of magnitude of contribution, neighbourhood made the most significant contribution (Beta= .858; t= 23.370; P<0.05) to the prediction follow by parenting style (Beta= .115; t= 3.130; p<0.05). In view of these findings, it was stressed and advocated that there is need to enlighten the adolescents in the school on the effects of neighbourhood and parenting style on study habit of students, parents/guardians also need to be trained on the need to monitor the adolescents and give adequate emotional caring for them. This will help in reducing the problems of being misguided by the peer to involve in unwanted behaviour and to enhance their study habit in the school.