(1) Background: The maltreatment of child labourers is a major public health concern. There is a dearth of research in Bangladesh on the intentional maltreatment of child labourers. This study explored the risk factors for the maltreatment of child labourers in rural Bangladesh based on the knowledge and understanding of experts; (2) Methods: Seventeen interviews were conducted with experts who were sampled using a purposeful approach. A thematic analysis was performed to analyse data using NVivo; (3) Results: Child labourers were exposed to maltreatment due to their demographic, their young age, dropping out of school, health complications, and excessive dependency on employers. Socio-cultural adversities such as corporal punishment practices, social stratification, and family disorganization pose risks of experiencing maltreatment. Economic poverty is also a factor. Child labourers were found to be victimized if they worked in violence prone sectors. Significantly, the unregulated market structure and the lack of monitoring has also led to the exploitation of children in the workplace. Gaps in public policies were also identified as risk factor for the maltreatment of child labourers; (4) Conclusion: There is a need for adequate evidence-based research on the determinants of the maltreatment of child labourers to formulate adequate policy.