UUA or Unitarian Universalist Association is a liberal religious association of Unitarian Universalist congregations.
UUA or Uua may also refer to:
- Bugulma Airport's IATA code
- Ua (singer) or Uua, Japanese singer
- UUA, a pilot report code for an "urgent" message
- United Utilities Australia or TRILITY, an Australian water utility, acquired by INCJ and others