Background: The perinatal period may uniquely impact the mental health and wellbeing of lesbian, gay, bisexual, transgender, queer, and Two-Spirit (LGBTQ2S+) childbearing individuals.Objectives: To characterise and synthesise the experiences of LGBTQ2S+ childbearing individuals regarding perinatal mental health, including symptomatology, access to care and care-seeking.Search Strategy: We conducted and reported a systematic review following PRISMA guidelines of eight databases (EMBASE, MEDLINE-OVID, CINAHL, Scopus, Web of Science: Core Collection, Sociological Abstracts, Social Work Abstract, and PsycINFO) from inception to 1 March 2021.