Problem Behaviour, Intelligence and Social Maturity are three factors which has a major and attractive role in social science researches. How the behaviour of children gets affected due to their level of intelligence is always a good topic for researchers. The aim of the study was to examine the effect of Intelligence on Social Maturity and Problem Behaviours. For carrying this study 40 children with different level of intelligence (severe, moderate and mild mentally retarded and average intelligence) were taken. In which 28 male and 12 female were included as sample. The data were collected from the General Services at NIMH, Secunderabad. Binet-Kamat Test of Intelligence and Malin Intelligence Scale for Indian Children, were used for Intelligence testing. For assessing the problem behaviour BASIC-MR, Part-B was used and for assessing the children's maturity level Vineland Social Maturity Scale was used.