Introduction Telehealth has become one of the main methods of delivering allied health professional services world-wide, yet many professionals do not have sufficient training to deliver high-quality telehealth services. This review aims to identify what competencies allied health professionals require for effective telehealth service delivery. Methods This scoping review used the Population Concept Context framework and searched the following databases: MEDLINE, CINAHL, PsychInfo, Cochrane, EMBASE, Web of Science, PEDro, United Kingdom Health Forum, WHO, Health Education England, and all UK and Australian AHP professional bodies. Results A total of 37 articles were included out of 92,525 identified by the literature search. Competencies were related to two areas: (1) delivery of the telehealth consultation and (2) service management of telehealth consultations. The first area included the following competency themes: clinical reasoning, communication, effectively using technology, person-centred care, practice-based assessment and intervention knowledge/behaviour/skills, privacy, security, and patient safety, professionalism, and setting up the technical environment. The second area included the following competency themes: digital infrastructure, informing practice, and management. Although findings emphasised the importance of telehealth competencies, none have been implemented within education. One-third of the articles were from the discipline of psychology. Conclusion This is the first scoping review to combine telehealth competencies reported across allied health disciplines. Although there were a vast range of competencies, they need implementation into teaching and learning to be practically useful. Most competencies were from psychology, but potentially applicable for other allied health professionals. A shared and adaptable standard for telehealth competencies would be useful to ensure high-quality practice across all allied health professionals.