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 (/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.
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).
Erin Marie Moran-Fleischmann (October 18, 1960 – April 22, 2017) was an American actress, best known for playing Joanie Cunningham on the television sitcom Happy Days and its spin-off Joanie Loves Chachi.
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.
Erika Girardi (born July 10, 1971), known professionally as Erika Jayne, is an American singer, actress and television personality.