ER or Er may refer to:
Ernest Miller Hemingway (July 21, 1899 – July 2, 1961) was an American novelist, short story writer, and journalist.
Eritrea (; Tigrinya: ኤርትራ ( listen)), officially the State of Eritrea, is a country in the Horn of Africa, with its capital at Asmara.
Eric Patrick Clapton, (born 30 March 1945), is an English rock and blues guitarist, singer, and songwriter.
Ernst & Young (doing business as EY) is a multinational professional services firm headquartered in London, England, United Kingdom.
In earth science, erosion is the action of surface processes (such as water flow or wind) that remove soil, rock, or dissolved material from one location on the Earth's crust, and then transport it to another location (not to be confused with weathering which involves no movement).
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).