DIA or Dia may refer to:
Diana, Princess of Wales (Diana Frances; née Spencer; 1 July 1961 – 31 August 1997), was the first wife of Charles, Prince of Wales, who is the eldest child and heir apparent of Queen Elizabeth II.
Diabetes mellitus (DM), commonly referred to as diabetes, is a group of metabolic diseases in which there are high blood sugar levels over a prolonged period.
Diazepam, first marketed as Valium, is a medication of the benzodiazepine family that typically produces a calming effect.
Diarrhea, also spelled diarrhoea, is the condition of having at least three loose or liquid bowel movements each day.
The Diagnostic and Statistical Manual of Mental Disorders (DSM), published by the American Psychiatric Association (APA), offers a common language and standard criteria for the classification of mental disorders.
Diamond (pronunciation: /ˈdaɪəmənd/ or /ˈdaɪmənd/) is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.
Diabetes mellitus type 1 (also known as type 1 diabetes) is a form of diabetes mellitus in which not enough insulin is produced.
Diane Ernestine Earle Ross (born March 26, 1944) is an American singer, songwriter, actress, and record producer.
Diabetes mellitus type 2 (also known as type 2 diabetes) is a long term metabolic disorder that is characterized by high blood sugar, insulin resistance, and relative lack of insulin.