| Acronym | Definition |
|---|
| ERN | Extended-Release Niacin |
| ERN | Eritrean Nakfa (ISO currency code) |
| ERN | École Royale Navale (French: Royal Naval School; Morocco) |
| ERN | European Rivers Network |
| ERN | Entreprise Régionale de Nettoyage (French: Regional Cleaning Company) |
| ERN | Error-Related Negativity (EEG recording) |
| ERN | Emergency Response Network |
| ERN | Employers' Reference Number (various locations) |
| ERN | Electronic Remittance Notice (US Medicare) |
| ERN | Encyclopedia of Religion and Nature (Continuum International) |
| ERN | Édition Régionale Nord (French: North Regional Edition) |
| ERN | Excise Reference Number (Ireland) |
| ERN | Environmental Regulatory Number |
| ERN | Education Recruitment Network (UK) |
| ERN | Engineering Release Notice |
| ERN | External Recurrent Neural Network |
| ERN | Estação Radionaval (Portugal) |
| ERN | Equipment Revenue Note (New Jersey Health Care Facilities Financing Authority) |
| ERN | Erasure Relay Network (network with binary erasure channels) |