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.
Diuresis (/ˌdaɪəˈriːsᵻs/) is increased urination and the physiologic process that produces such an increase.
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.
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.
Diuris, commonly known as donkey orchids, is a genus of more than sixty species of flowering plants in the orchid family, Orchidaceae and is endemic to Australia apart from one species endemic to Timor.
In meteorology, diurnal temperature variation is the variation between a high temperature and a low temperature that occurs during the same day.
Diunna Greenleaf (born October 6, 1957) is an African American blues singer and songwriter.
Diu (Traditional Chinese: 屌 Hong Kong coinage: 𨳒 [門+小] jyutping: diu2 pinyin: diǎo) is a common profanity in Cantonese.