The objective of the scoping review was to explore the evidence and describe what is known about perinatal bereavement care guidelines provided within health care facilities prior to discharge. Additionally, the review sought to identify what is known about parents' mental health outcomes, and map these outcomes to the characteristics of the bereavement care guidelines. Perinatal loss poses a serious risk of emotional trauma and mental health sequelae. Conflicting evidence for international bereavement care guidelines and inconsistent implementation, a lack of experimental studies, and older syntheses with a limited focus or population made synthesis complex. Therefore, a scoping review was undertaken to determine the breadth and depth of the existing literature on this topic. Sources pertaining to bereavement care guidelines used in health care facilities immediately after perinatal loss (miscarriage, stillbirth, or neonatal death) and parents' mental health outcomes were included. Sources pertaining to family members other than parents, perinatal loss occurring outside of a health care facility, and physical care guidelines were excluded. The review was conducted using JBI methodology for scoping reviews. The team considered quantitative and qualitative studies, practice guidelines, case reports, expert opinions, systematic reviews, professional organization websites, and gray literature. CINAHL (EBSCOhost), PsycINFO (EBSCOhost), SocINDEX (EBSCOhost), Cochrane Library, JBI Evidence-based Practice Database (Ovid), Embase, PubMed (NLM), ProQuest Dissertations and Theses A&I (ProQuest), Web of Science Core Collection, and Epistemonikos were the major databases searched. OpenGrey, Google Scholar, and organizational websites were also searched. The earliest empirical study publication found (1976) served as the starting date limit. After pilot-testing the screening process, data were extracted, collated, and presented in narrative form as well as in tables and figures. The search was first conducted in September and October 2021, and an updated search was performed on February 9, 2023. The results provide a broad view of bereavement care guidelines to support grieving parents' mental health. The included sources (n = 195) were comprised of 28 syntheses, 96 primary studies, and 71 literature review/text and opinion. From the studies that specified the number of participants, 33,834 participants were included. Key characteristics of bereavement care guidelines were categorized as i) making meaning/memories, ii) good communication, iii) shared decision-making, iv) effective emotional and social support, and v) organizational response. Parents' reported mental health outcomes included both negative outcomes, such as depression, anxiety, anger, and helplessness, and positive outcomes, including coping, healing, recovery, and well-being. Conceptually the characteristics of published guidelines are fairly consistent across settings, with cultural variations in specific components of the guidelines. Despite the exponential increase in research pertaining to bereavement care after perinatal loss, there is a gap in research pertaining to certain characteristics of bereavement care guidelines accepted as best practice to support parents' mental health outcomes. This review provides support for future research given the trauma and mental health risks following perinatal loss. Policies ensuring consistent and appropriate implementation of bereavement care guidelines are essential to improve parents' mental health outcomes.