| Acronym | Definition |
|---|
| ARENA | Alianza Republicana Nacionalista (Nationalist Republican Alliance Party, El Salvador political party) |
| ARENA | National Renewal Alliance |
| ARENA | Aliança Renovadora Nacional (Brazilian historical political party) |
| ARENA | Applied Research Ethics National Association |
| ARENA | Advanced Research on the Europeanisation of the Nation-State |
| ARENA | National Republican Alliance Party (El Salvador) |
| ARENA | Antarctic Research, a European Network for Astronomy (European Union) |
| ARENA | Adoption Resource Exchange of North America |
| ARENA | Automated Recourse to Electronic Negotiation Archives |