| Acronym | Definition |
|---|
| UA | United Airlines |
| UA | United Artists |
| UA | Ukraine (ISO Country Identifier) |
| UA | University of Alabama |
| UA | University of Arizona |
| UA | User Agent (web browser) |
| UA | Under Armour (stock symbol) |
| UA | Routine (pilot report message type) |
| UA | University of Arkansas |
| UA | Unavailable |
| UA | User Agreement |
| UA | Unified Architecture (open connectivity) |
| UA | Universidad de Alicante (Spain) |
| UA | Urinalysis |
| UA | Universidade de Aveiro (Portugal) |
| UA | University of Akron (Ohio) |
| UA | Und Andere (German: and others) |
| UA | User Account |
| UA | University Archives |
| UA | Unter Anderem (German: Among Other Things) |
| UA | Under Age |
| UA | University of Antwerp |
| UA | Unattended |
| UA | User Authentication |
| UA | University of Alaska |
| UA | Upper Air |
| UA | Urban Area |
| UA | Unstable Angina |
| UA | Urine Analysis |
| UA | User Activity |
| UA | University of Alberta |
| UA | Unarmed (gaming) |
| UA | Upper Arlington (Ohio) |
| UA | University of Aveiro (Portugal) |
| UA | Unauthorized Absence (Article 86 UCMJ) |
| UA | Unfair Advantage (CSI Data) |
| UA | Upper Arm |
| UA | User Assistance |
| UA | Unitary Authority (local government area, UK) |
| UA | University at Albany (SUNY) |
| UA | Unmanned Aircraft |
| UA | Unit Area |
| UA | University of Aberdeen (UK) |
| UA | Unaddressed |
| UA | Uniform Act (Uniform Relocation Assistance and Real Property Acquisitions Policies Act of 1970, as amended) |
| UA | Unit of Action |
| UA | User Area |
| UA | Unique Address |
| UA | Unit of Action (US Army) |
| UA | Underactive |
| UA | Umbilical Artery |
| UA | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada (Union) |
| UA | Microampere (electronics) |
| UA | Units of Account (banking) |
| UA | Unarmored (gaming) |
| UA | Uniform Allowance |
| UA | Unnumbered Acknowledge (telecommunications) |
| UA | Uto-Aztecan (language) |
| UA | Unnumbered Acknowledgment |
| UA | Unit Administrator (military term) |
| UA | Unique Applications |
| UA | Underground Atlanta |
| UA | Universal Adversary |
| UA | Universidade da Amazônia (Brasil) |
| UA | User Agency |
| UA | University of the Arctic |
| UA | Update Analysis |
| UA | Utility Accrual |
| UA | Unbalanced Asynchronous |
| UA | Ultimate Adventures |
| UA | Universal Architecture |
| UA | Unit Administration |
| UA | Unbelievably Amazing |
| UA | Unequal Angle (mechanical material engineering) |
| UA | Ultimate Adversaries (D20 Star Wars Roleplaying sourcebook) |
| UA | Uracil-Adenine (RNA base pairing) |
| UA | Unmarried America |
| UA | Últimos Adictos (Guatemala rock group) |
| UA | Urauffuhrung (German: World Premiere) |
| UA | Unable to Approve Arrival for the Time Specified |
| UA | Harley-Davidson World War II 74 cubic inch V-twin military motorcycle model |
| UA | Underwriters Accepted |
| UA | Ulkomaankaupan Agenttiliitto (Suomeksi) (Finnish Foreign Trade Agents' Federation, aka: FFTAF) |
| UA | Unnecessary Acronym |
| UA | University of California Audits |