ER or Er may refer to:
Ernest Miller Hemingway (July 21, 1899 – July 2, 1961) was an American novelist, short story writer, and journalist.
Eric David Harris (April 9, 1981 – April 20, 1999) and Dylan Bennet Klebold (September 11, 1981 – April 20, 1999) were the two American high school seniors who committed the Columbine High School massacre.
Eritrea (/ˌɛrᵻˈtreɪ.ə/ or /ˌɛrᵻˈtriːə/), officially the State of Eritrea, is a country in the Horn of Africa.
Eric Patrick Clapton, CBE (born 30 March 1945), is an English rock and blues guitarist, singer, and songwriter.
Ernest Borgnine (born Ermes Effron Borgnino; /ˈbɔːrɡnaɪn/; January 24, 1917 – July 8, 2012) was an American film, television, character and voice actor whose career spanned more than six decades.
Erwin Rommel (15 November 1891 – 14 October 1944), popularly known as the Desert Fox, was a field marshal (senior military commander) in the Wehrmacht of Nazi Germany during World War II.
The Erie Canal is a canal in New York 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).
EY (formerly Ernst & Young) is a multinational professional services firm headquartered in London, 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, then transport it away to another location.