ER or Er may refer to:
Ernest Miller Hemingway (July 21, 1899 – July 2, 1961) was an American journalist, novelist, short-story writer, and sportsman.
Eritrea (; (listen); Tigrinya: ኤርትራ), officially the State of Eritrea, is a country in the Horn of Africa, with its capital at Asmara.
Johannes Erwin Eugen Rommel (15 November 1891 – 14 October 1944) was a German general and military theorist.
Eric Patrick Clapton, (born 30 March 1945) is an English rock and blues guitarist, singer, and songwriter.
Eric Scott Esch (born August 3, 1966), better known by his nickname "Butterbean", is an American retired professional boxer, kickboxer, mixed martial artist, and professional wrestler who competed in the heavyweight division.
The Erie Canal is a canal in New York, United States that is part of the east–west, cross-state route of the New York State Canal System (formerly known as the New York State Barge Canal).
In earth science, erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location (not to be confused with weathering which involves no movement).
Eric Daniel Pierre Cantona (French pronunciation: [eʁik kɑ̃tona]; born 24 May 1966) is a French actor and former professional footballer.