UA or ua may refer to:
- Unmanned Aircraft
- Universal Audio Inc, a designer and manufacturer of audio signal processing hardware and software.
- German submarine U-A, a German submarine of the Second World War
- The Umbrella Academy, a graphic novel by Gerard Way
- Unauthorized Absence
- Unitary authority, local government division in England
- Urbanized Area
- Future Force Unit of Action, proposed US Army tactical unit
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