The aims of this article are to (1) present a shared definition of weight stigma related to pregnancy and (2) develop a definition to inform valid and reliable nursing research addressing weight stigma in the obstetric setting. Weight stigma is increasingly prevalent in society, especially among women with prepregnancy overweight or obesity. However, a universally accepted definition of weight stigma related to pregnancy has yet to be identified. We followed Walker and Avant's concept analysis methodology using an iterative approach to ensure a robust and conceptually sound definition of weight stigma related to pregnancy.