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Women in low- and middle-income countries (LMICs) may engage in a range of cultural food practices during pregnancy, including restricting or avoiding foods high in protein and iron, and foods rich in vitamins and minerals. While research has explored the cultural food practices of pregnant women in LMICs, there is less understanding of the continued cultural food practices of women who migrate to high-income countries and then become pregnant. This systematic review explores the existing research on cultural food practices and sources of nutrition information among pregnant and postpartum migrant women from LMICs, residing in high-income countries. A systematic search was conducted in April 2024 across Global Health, CINAHL, and MEDLINE, published in English, with no date restrictions. Eligible studies included those focused on pregnant and postpartum women who had migrated from LMICs to high-income countries. Studies were excluded if they comprised of non-immigrant women or did not involve LMIC participants. Screened were studies for eligibility, data were extracted, and study quality was assessed. In total, 17 studies comprising qualitative (n = 10) and quantitative (n = 7) approaches were included. In 14 studies participants adhered to cultural food practices, wherein certain nutritious foods were restricted during pregnancy or the postpartum period; three studies noted limited adherence due to support, acculturation, and access to traditional foods. Most studies (n = 10) reported traditional “hot” and “cold” food beliefs during pregnancy and postpartum, aiming to maintain humoral balance for maternal and child health and to prevent miscarriage. Nutrition advice was sought from family members, friends, relatives, healthcare providers, and media sources, with a preference for advice from family members in their home countries. There is a need for culturally appropriate nutrition education resources to guide pregnant migrants through healthy and harmful cultural food practices and overall nutrition during this crucial period. (PROSPERO Registration: CRD42023409990).