Diu or DIU may refer to:
A diuretic is any substance that promotes diuresis, that is, the increased production of urine. This includes forced diuresis.
Diuma (or Dwyna or Duma) was the first Bishop of Mercia in the Anglo-Saxon Kingdom of Mercia, during the Early Middle Ages.
Diuresis (/ˌdaɪəˈriːsᵻs/) is increased urination and the physiologic process that produces such an increase.
Diusse is a commune in the Pyrénées-Atlantiques department in south-western France.
Diuris orientis, commonly called the wallflower orchid or eastern wallflower orchid, is a species of orchid which is endemic to eastern Australia.
The Diu Fort, is located on the west coast of India in Diu, a Union Territory, administered by the Government of India.
Diu is a town in Diu district in the union territory of Daman and Diu, India. Diu District is the tenth least populated district of India.
Diuronotus aspetos is a species of large sized meiofaunal chaetonotid gastrotrich found in the North Atlantic.
Diurnality is a form of plant or animal behavior characterized by activity during the day, with a period of sleeping, or other inactivity, at night.