Der or DER may refer to:
Dermatitis, also known as eczema, is a group of diseases that results in inflammation of the skin. These diseases are characterized by itchiness, red skin, and a rash.
Derek Sanderson Jeter (/ˈdʒiːtər/ JEE-tər) (born June 26, 1974) is an American former professional baseball shortstop who played 20 seasons in Major League Baseball (MLB) for the New York Yankees.
The derivative of a function of a real variable measures the sensitivity to change of a quantity (a function value or dependent variable) which is determined by another quantity (the independent variable).
In finance, a derivative is a contract that derives its value from the performance of an underlying entity.
Derby County Football Club (/ˈdɑːrbi ˈkaʊnti/) is a professional association football club based in Derby, Derbyshire, England.
Derrick Martell Rose (born October 4, 1988) is an American professional basketball player for the New York Knicks of the National Basketball Association (NBA).
Derry (/ˈdɛrɪ/), officially Londonderry (/ˈlʌndənˌdɛrɪ/), is the second-largest city in Northern Ireland and the fourth-largest city on the island of Ireland.
Derby (/ˈdɑːrbi/ DAR-bi) is a city and unitary authority area in Derbyshire, England. It lies on the banks of the River Derwent in the south of Derbyshire, of which it was traditionally the county town.
Der Ring des Nibelungen (The Ring of the Nibelung), WWV 86, is a cycle of four German-language epic music dramas composed by Richard Wagner.