ERO

ERO or Ero may refer to:

Science and technology

Easily Recoverable Object, a subclass of near-Earth object that is easily recoverable
Early Release Observations, of the James Webb Space Telescope
Edge recombination operator, an operator in genetic algorithms
Elementary row operations, an operation performed on the rows of an elementary matrix in mathematics
Ero (spider), a genus of pirate spiders
Extremely Red Object, astronomical source of radiation with extreme redshift

Education Review Office (New Zealand), an agency of the New Zealand government
Electoral registration officer, in the UK, a person appointed by a local authority to compile and maintain the electoral roll
Electronic return originator, an authorized IRS e-file provider which originates the electronic submission of a return
Enforcement and Removal Operations, a section of U.S. Immigration and Customs Enforcement
The Emergency Regulations Ordinance (Cap. 241) of Hong Kong

Eugenics Record Office (1910-1939), a center for eugenics and human heredity research in America
ICFTU European Regional Organisation (1950-1969), regional confederation of trade unions
European Radiocommunications Office, former name of the European Communications Office, part of the European Conference of Postal and Telecommunications Administrations
Emergency response officers (EROs) are people who are trained to be the first line of response in any emergency situation.

Ero, an abbot in The Legend of Ero of Armenteira
Končar-Arma ERO, a Croatian submachine gun similar to the Israeli-made Uzi submachine gun