Following international trends, in Thailand there are significantly fewer women than men who work at the senior level in public service and law enforcement occupations, especially in the police and armed forces. Utilizing the Royal Thai Police (RTP) as a case study, this research aims to identify the opportunities and barriers for promotion that impact women in the RTP and to analyze why few women work at the senior level for both police and administration or office-based work. Statistical data from the past 20 years is used to determine the trend of women’s employment in the RTP. This is supported by semi-structured interviews to promote information on women’s experiences within the RTP. This paper outlines my doctoral research design and methodology, and describes three major promotional barriers towards policewomen, namely, limited numbers of senior positions for women, lack of support from supervisors, and issues relating to the promotion examinations.