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