Echolalia, a language phenomenon whereby individuals imitate the speech of others, is commonly used by children and adults with autism. Research into the underlying nature and meanings associated with this repetitive behaviour is characterised by a lack of conceptual definitions and conflicting opinions about the functions of echolalia. A scoping review was undertaken to summarise the range of perspectives on these topics and identify associated research gaps. Five databases were searched, and 28 studies met the eligibility criteria. Results showed clear groupings in the topics discussed, based around interactional intent, factors that affect the frequency and type of echolalia, language development, measurement, and functions of echolalia. The review revealed that echolalia has a number of functions for people with autism, however many interventions continue to focus on reduction or elimination of echolalia. Findings suggest that further research is required to examine possible functions of echolalia. Confirming the function of this behaviour for people with autism is likely to have direct consequences for the type of intervention deemed appropriate.