ER or Er may refer to:
Ernest Miller Hemingway (July 21, 1899 – July 2, 1961) was an American journalist, novelist, and short-story writer.
Eric Patrick Clapton, (born 30 March 1945), is an English rock and blues guitarist, singer, and songwriter.
Eritrea (; (listen)), officially the State of Eritrea is a country in the Horn of Africa, with its capital at Asmara.
Erica Abi Wright (born February 26, 1971), known professionally as Erykah Badu (), is an American singer and songwriter.
Ernst & Young (doing business as EY) is a multinational professional services firm headquartered in London, England, United Kingdom.
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).