WAA
- Crow (Australian Aboriginal mythology)
- Namatahi Waa
- Wa (unit)
- Waffenamt
- Wales Airport (Alaska)
- Walla Walla language
- War Assets Administration
- Wealth attained advantage
- West African Airlines
- Westair Aviation
- Western Association of Architects
- Wiltshire Air Ambulance
- Women's Action Alliance
- Woolclassers' Association of Australia
- Workers Alliance of America
- World Archery Asia
- Wreaths Across America