Introduction: Problems in the behaviour of a child suffering from autism spectrum disorder (ASD) can influence the mental health of parents and their parenting style. This research was aimed in identifying the relationship between behaviour problems in ASD children with parental stress and parenting styles. Methods: 79 parents with ASD chil- dren aged 4 to 12 years were recruited based on convenience sampling from various organisations. The instruments used in this study included a Strengths and Difficulties Questionnaire, Parenting Stress Index, and Parenting Styles and Dimensions Questionnaire. Data were then analysed by Pearson’s chi-squared and Pearson’s product-moment correlation coefficient using SPSS software. Results: Overall, most of the children with ASD in this study had abnor- mal peer problems. Parents of children with ASD used mostly authoritative parenting style. Prosocial behaviour was strongly correlated to parental stress. Child gender, Parent-Child Dysfunctional Interaction (P-CDI) and prosocial behaviour impacted the use of an authoritative parenting style, the parent’s age impacted the authoritarian parenting style, and the parent’s ethnicity, marital status, additional caregivers, parental distress and difficult children influ- enced a permissive parenting style. Conclusion: Understanding the relationship of the behaviour of ASD children with parental stress and parenting styles can enhance the provision of effective services by health care professionals.