This thesis, based on empirical evidence and documentary analysis, critically evaluates the systems under the regulatory oversight of the Royal Thai Police (RTP), the Office of the Ombudsman, the National Human Rights Commission (NHRC) and the National Anti-Corruption Commission (NACC) in respect of the handling of police complaints. Comparisons will be drawn from the system under the control of the Independent Police Complaints Commission (IPCC) in England and Wales in order to provide alternative perspectives to the Thai police complaints system. This thesis proposes a civilian control model of a police complaints system as a key reform measure to instill public confidence in the handling of complaints in Thailand. Additional measures ranging from sufficient power and resources, complainants’ involvement, securing transparency and maintaining police faith in the system are also recommended to enhance the proposed system.