Di or DI may refer to:
In computing, a Digital Object Identifier or DOI is a persistent identifier or handle used to uniquely identify objects, standardized by the ISO.
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.
Madeleine Beth McCann (born 12 May 2003) disappeared on the evening of 3 May 2007 from her bed in a holiday apartment in Praia da Luz, a resort in the Algarve region of Portugal, sparking what one newspaper called "the most heavily reported missing-person case in modern history".
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.