The objective of this review was to map the available evidence regarding the scope of child life specialist services, practice, and utilization. The concept of child life services began in 1922 and emerged as the child life specialist services specialty in the United States in the 1970s and 1980s. Child life specialists are members of multidisciplinary health care system teams who prioritize the developmental needs of pediatric patients to support and improve patient and family health care experiences. Evidence of the effectiveness of child life specialist services and the utilization of those services is often incorporated in multidisciplinary research reports and thus overlooked. All quantitative, qualitative, and mixed methods research study reports and systematic reviews investigating child life specialist services, practice, and utilization in health care systems were included. This review was guided by the JBI methodology for scoping reviews and a published a priori protocol. CINAHL (EBSCOhost), MEDLINE (PubMed), Scopus, and PsycINFO (APA) were searched for evidence published from January 1980 to August 2022. Research publications about child life specialist services, practice, and utilization have increased dramatically over the past decade, with more than 50% of studies published in the past 5 years. Although the first authors of the majority of the research publications were physicians, these multidisciplinary author teams depicted child life specialist services in a variety of roles, including co-investigators, interventionists, and research subjects. The 105 full-text publications reviewed were from 9 countries, plus 1 publication that surveyed people across Europe. The contexts spanned a wide scope of clinical settings and medical subspecialties, but primarily in hospitals and health centers, and to a lesser extent, in ambulatory clinics and communities. A wide variety of child life specialist services were described across these settings. Mapping the research can help delineate the barriers and facilitators to child life specialist services in health care systems. This scoping review provides evidence of the global diffusion of child life specialist services across health care system settings, with recent increases in research publications involving child life specialist services.