This integrative review synthesizes research studies in order to explore the perceptions of allied health professionals regarding interprofessional collaboration in primary health care. A comprehensive literature search was conducted using three electronic databases and a manual search of the Journal of Interprofessional Care. The Crowe Critical Appraisal Tool was used to assess the quality of included papers. Study findings were extracted, critically examined and grouped into themes. Twelve studies conducted in six different countries met the inclusion criteria. Thematic analysis revealed five themes: (1) shared philosophy; (2) communication and clinical interaction; (3) physical environment; (4) power and hierarchy; and (5) financial considerations. This review has identified diverse key elements related to interprofessional collaboration in primary health care, as perceived by allied health professionals. Opportunity for frequent, informal communication appeared essential for interprofessional collaboration to occur. Allied health professionals working in close proximity to health practitioners from other professions had more regular interprofessional interactions than those who were geographically separated. Co-location of multiple primary health care services within the same physical space may offer increased opportunities for interprofessional collaboration. Future research should avoid reporting on allied health professionals in primary health care collectively, and isolate data to the individual professions. Direct observational methods are warranted to investigate whether allied health professionals’ perceptions of interprofessional collaboration align with their actual clinical interactions in primary health care settings.