ER or Er may refer to:
Eritrea (; (listen)); Arabic: إريتريا as- Ērītrēa) State of Eritrea, is a country in the Horn of Africa, with its capital at Asmara.
Ernest Miller Hemingway (July 21, 1899 – July 2, 1961) was an American journalist, novelist, short-story writer, and noted sportsman.
Eric Patrick Clapton, (born 30 March 1945) is an English rock and blues guitarist, singer, and songwriter.
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).
Johannes Erwin Eugen Rommel (15 November 1891 – 14 October 1944) was a German general and military theorist.
Erika Nay Girardi (née Chahoy; born July 10, 1971), known professionally as Erika Jayne, is an American singer and actress.
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 Michael Swalwell Jr. (born November 16, 1980) is an American politician from California, who serves as the U.S.