Jer or JER may refer to:

Places Pic du Jer, a peak in the Hautes-Pyrénées, France JER, abbreviation for Jersey, a British Crown Dependency off the coast of Normandy, France

Language a yer or jer, a Proto-Slavic vowel, or letter of the Cyrillic (ъ, ь) or Glagolitic alphabet jēr, the Gothic alphabet equivalent of jēran (), of the j-rune of the Elder Futhark jer, ISO 639-3 code for the Jere language, a dialect cluster of Kainji languages in Nigeria

Given name Jeremiah Jer Collison (1890-?), Irish hurler and Gaelic footballer Jeremiah Jer Doheny (1874–1929), Irish hurler Jeremiah Jer Dwyer (1854-?), Irish hurler Jeremy Jer Lau (born 1992), Hong Kong singer Jer Norberg (1873-?), Irish hurler Gerard Patrick Jer D. O'Connor (born 1940), Irish former Gaelic footballer

Other uses Jer., an abbreviation for the Book of Jeremiah in the Hebrew Bible Journal of the Early Republic, a peer-reviewed academic journal which focuses on the early history and culture of the United States from 1776 to 1861 JER, IATA code for Jersey Airport, on the island of Jersey JER, musical project of Jeremy Hunter, better known as Skatune Network