OBJECTIVES The “rule of halves” (ROH) applies in most common chronic disorders and suggests that half of the patients are undiagnosed, half of those diagnosed are not treated, and half of those treated are not controlled. The aim of the present study was to examine whether the ROH is applicable in the case of Diabetes type 2 in Greece. METHODS Physicians who monitor patients with type 2 diabetes were invited to participate and complete the online version of a purpose-made questionnaire during a specified time period. An invitation was sent to the national associations of general practitioners (GPs), diabetologists and endocrinologists. The study took place between April and May 2014. Fully completed questionnaires were included in the analysis. Data analysis was conducted using STATA 9. RESULTS