Service user involvement in interprofessional education and collaborative practice remains limited despite the increasing push for this by governments and grant funding bodies. This rapid review investigated service user involvement in interprofessional education, practice, and research to determine factors that enable or hinder such involvement. Following the Cochrane and the World Health Organization’s rapid review guidelines, a targeted search was undertaken in four databases. Subsequent to the screening processes, included papers were critically appraised, and extracted data were synthesized narratively. Sixteen studies met inclusion criteria. Most studies were related to interprofessional collaborative practice, as opposed to education and research. Service user involvement was more in the form of consultation and collaboration, as opposed to consumer-led partnerships. Enablers and barriers to service user involvement in IPECP were identified. Enablers included structure, the valuing of different perspectives, and relationships. Barriers included time and resources, undesirable characteristics, and relationships. This rapid review has added evidence to a swiftly expanding field, providing timely guidance. Healthcare workers can benefit from targeted training. Policy makers, healthcare organizations, and governments can investigate strategies to mitigate the time and resource challenges that impede service user involvement in IPECP.