This study explores the impact of migration on the access and utilisation of sexual and reproductive health services by women living in an informal settlement in Dhaka, Bangladesh. A total of 16 in-depth interviews were conducted in March and April of 2019 with women (18–49 years old) who had migrated from rural areas to Dhaka. They reported continued economic insecurity while receiving minimal support from the state. All women reported financial and infrastructural barriers to accessing formal sexual and reproductive health services and tended to seek resources and support through social networks within the slum and from informal health services. Compared with more recent migrants, women who had migrated and resided in the slums for longer found it easier to utilise social networks and resources for sexual and reproductive health. Women had more agency in experimenting with contraceptives but had less power in making decisions during pregnancy and when seeking health care. Menstrual health was a neglected aspect of public health. The study indicates that public health policy targeting the urban poor needs to address the unique challenges faced by migrant women in informal settlements to rectify inequities in health services that leave significant portions of the urban poor population behind.