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.
The derivative of a function of a real variable measures the sensitivity to change of the function value with respect to a change in its argument (input value).
Sir Derek Alton Walcott, KCSL, OBE, OCC (23 January 1930 – 17 March 2017) was a Saint Lucian poet and playwright.
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.
In finance, a derivative is a contract that derives its value from the performance of an underlying entity.
Derry (/ˈdɛrɪ/), officially Londonderry (/ˈlʌndənˌdɛrɪ/), is the second-largest city in Northern Ireland and the fourth-largest city on the island of Ireland.
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).
Deron Michael Williams (/ˈdɛrən/ DERR-in; born June 26, 1984) is an American professional basketball player for the Cleveland Cavaliers of the National Basketball Association (NBA).