BACKGROUND Considering the high risk of maternal morbidity and mortality, increased risks of unintended pregnancy, and the unmet need for contraceptives prevalent among the Rohingya refugees, this study aims to explore the knowledge, attitude, and practice (KAP) of family planning (FP) and associated factors among Rohingya women living in refugee camps in Bangladesh. METHODS Four hundred Rohingya women were interviewed. Data were collected using a structured and pretested questionnaire, which included study participants' socio-demographic characteristics, access to FP services, knowledge, attitude, and practice of FP. Linear regression analysis was performed to identify the influencing factors of FP-KAP. RESULTS Of the 400 Rohingya refugee women, 60% were unaware that there was no physical harm brought by using a permanent method of birth control. Half of the women lack proper knowledge regarding whether a girl was eligible for marriage before the age of 18. More than two-thirds of the women thought family planning methods should not be used without the husband's permission. Moreover, 40% were ashamed and afraid to discuss family planning matters with their husbands. Of the study participants, 58% had the opinion that a couple should continue bearing children until a son is born. Linear regression analyses found that study participants' who have a profession, have less children, whose primary source of FP knowledge was through a physician/nurse, have had FP interventions in the camp, and talk with a health care provider on FP were found to have better FP-KAP. CONCLUSIONS The study showed that Rohingya refugee women are a marginalized population in terms of family planning and their comprehensive FP-KAP capability was low. Contraceptives among the Rohingyas were unpopular, mainly due to a lack of educational qualifications and family planning awareness. In addition, family planning initiatives among Rohingya refugees were limited by a conservative culture and religious beliefs. Therefore, strengthening FP interventions and increasing the accessibility to essential health services and education are indispensable to improving improve maternal health among Rohingya refugees.