Background Establishing the benefits of patient and public involvement (PPI) in emergency care research is important to improve the quality and relevance of research. Little is known about the extent of PPI in emergency care research, its methodological and reporting quality. This scoping review aimed to establish the extent of PPI in emergency care research, identify PPI strategies and processes and assess the quality of reporting on PPI in emergency care research. Methods Keyword searches of five databases (OVID MEDLINE, Elsevier EMBASE, EBSCO CINAHL, PsychInfo, Cochrane Central Register of Controlled trials); hand searches of 12 specialist journals and citation searches of the included journal articles were performed. A patient representative contributed to research design and co-authored this review. Results A total of 28 studies reporting PPI from the USA, Canada, UK, Australia and Ghana were included. The quality of reporting was variable, with only seven studies satisfying all Guidance for Reporting Involvement of Patients and the Public short form reporting criteria. None of the included studies adequately described all the key aspects of reporting the impact of PPI. Conclusion Relatively few emergency care studies comprehensively describe PPI. Opportunity exists to improve the consistency and quality of reporting of PPI in emergency care research. Further research is required to better understand the specific challenges for implementing PPI in emergency care research, and to determine whether emergency care researchers have adequate resources, education and funding to undertake and report involvement.