An erg is a unit of energy.

Erg, Ergs or ERG may also refer to:

Arts and entertainment

• Mikey Erg (born 1980), American musician

• Erg (character), a fictional character in the Marvel Comics Universe

• Erg (Hyperion), a creature in the Hyperion Cantos series by Dan Simmons

Organisations

• Education Reference Group, in Connecticut, US

• Erg (company), an Italian energy company

• Efficiency and Reform Group (May 2010 – October 2014), former part of the Cabinet Office of the UK

• Eurasian Resources Group, a Luxembourgish mining and smelting company

• European Research Group, anti-EU group of British Conservative MPs

• Videlli, an Australian smart card ticketing system manufacturer formerly known as ERG Group

Places

• English Riviera Geopark, in Torbay, England

• Erbogachen Airport (IATA code), Russia

Science and technology

• Electron-releasing group

• Electroretinography, or electroretinogram

• Erg (landform), sand dune field

• ERG (gene)

• ERG theory, in psychology

• Exploration of Energization and Radiation in Geospace, now Arase, a Japanese scientific satellite

Other uses

• Employee resource group, groups of employees who join together in their workplace

• Emergency Response Guidebook, a hazardous-materials (HAZMAT) reference book

• Erg (indoor rower)

• Erg (tug), a Canadian tug, sunk in Halifax Harbour in 1943

• Ergative case