The role of the patient’s mother tongue in clinical communication is of vital importance and yet it is not always dealt with adequately by healthcare professionals and healthcare systems. Cultural competence should deal with and redress asymmetries in doctor–patient communication, including those having an impact on the patient’s mother tongue. The aim of this study was to answer a research question: what are the health professionals’ perceptions of the importance and role of the patients’ mother tongue in diglossic situations? To answer our research question, we carried out two focus groups, one with doctors and another with nurses working in public hospitals in the Valencian Community (Spain) where two languages share officiality, ...