There has been a global increase of deviant behaviour in learning institutions most of which has resulted to destruction of property, loss of life, loss of learning time and decline in academic performance. Despite implementation of policies and recommendations from the Ministry of Education, students still engage in deviant behaviour. Previous studies have not focused much on Social Economic Status as a contributor of deviant behaviour and most specifically why students from high SES may be predisposed to engage in aberrant behaviour. The goal of the study was to investigate the influence of socio-economic factors on deviant behaviours among secondary school students in Murang’a East Sub County, Murang’a County, Kenya. The objectives of the study were: to investigate the influence of family socio-economic status on deviant behaviour, to examine the extent of social media access on the deviant behaviour, and to analyze how social environment stimulates deviant behaviour among secondary school students. This research utilized a cross-sectional survey design and employed a mixed method approach. The target population was 390 students and key informants comprising of 15 Principals and 15 Guidance and Counselling Coordinators. The sample was acquired from 33 secondary schools in Murang’a East Sub County and was obtained using proportional stratified sampling as well as Simple Random Sampling. The study utilized a semi- structured questionnaire and an interview guide to collect data. The quantitative data was analyzed descriptively using SPSS version 25 and was presented in tables, charts, and bar graphs. Qualitative data was analyzed thematically. Family socioeconomic status was found to be positively correlated to deviant behaviour. Access to social media was positively associated to deviant behaviour with students acquiring aberrant behaviour through imitation and observation. A significant positive relationship between social environment and deviant behaviour was established. The study discovered practical strategies that can help curb deviant behaviour in secondary schools. This study recommended building a healthy environment for the students in the family and community with the aim of promoting positive behaviour.