ERO

ERO may refer to:

• Edge recombination operator, an operator in genetic algorithms
• Electoral Registration Officer, a person is appointed by a local authority for the purpose of compiling and maintaining the electoral register
• Elementary row operations, in mathematics, certain operations that are performed on the rows of a matrix
• Extremely Red Objects, astronomical sources of radiation with extreme redshift
• Eugenics Record Office, a center for eugenics and human heredity research in America for the first half of the twentieth century.
• European Radiocommunications Office (now European Communications Office (ECO)), part of the European Conference of Postal and Telecommunications Administrations
• Končar-Arma ERO, a Croatian submachine gun similar to the Israeli-made Uzi submachine gun
• New Zealand Education Review Office