Background: Improving the quality of maternal health care is critical to reduce mortality and improve women's experiences. Mistreatment during childbirth in health facilities can be an important barrier for women when considering facility-based childbirth. Therefore, this study attempted to explore the acceptability of mistreatment during childbirth in Myanmar according to women and healthcare providers, and to understand how gender power relations influence mistreatment during childbirth. Methods: A qualitative study was conducted in two townships in Bago Region in September 2015, among women of reproductive age (18-49 years), healthcare providers and facility administrators. Semi-structured discussion guides were used to explore community norms, and experiences and perceptions regarding mistreatment. Coding was conducted using athematic analysis approach and Atlas.ti. Results were interpreted using a gender analysis approach to explore how power dynamics, hierarchies, and gender inequalities influence how women are treated during childbirth. Results: Women and providers were mostly unaccepting of different types of mistreatment. However, some provided justification for slapping and shouting at women as encouragement during labour. Different access to resources, such as financial resources, information about pregnancy and childbirth, and support from family members during labor might impact how women are treated. Furthermore, social norms around pregnancy and childbirth and relationships between healthcare providers and women shape women's experiences. Both informal and formal rules govern different aspects of a woman's childbirth care, such as when she is allowed to see her family, whether she is considered "obedient", and what type of behaviors she is expected to have when interacting with providers.