EUA can stand for:
- The initialism in various Romance languages, equivalent to the English "USA", referring to the United States of America
- European University Association
- End User Agreement
- European Unit of Account
- EU emission Allowance (EUA), see European Union Emission Trading Scheme
- Emergency Use Authorization, in the United States, a means for the Food and Drug Administration to approve new drugs or new indications for previously approved drugs during a declared emergency.
- The IOC code currently applied for the Olympic United Team of Germany of 1956-1964
- Examination under anesthesia (medical contexts)