WAA

Waa or WAA may refer to:
 * Crow (Australian Aboriginal mythology)
 * Namatahi Waa (born 1990), New Zealand rugby union player
 * Wa (unit), a Thai unit of length
 * Waffenamt, a research and development agency of Nazi Germany
 * Wales Airport (Alaska)
 * Walla Walla language
 * War Assets Administration
 * West African Airlines, a Beninese airline
 * Westair Aviation, a Namibian airline
 * Western Association of Architects, a defunct professional body
 * Wiltshire Air Ambulance, serving Wiltshire, England
 * Women's Action Alliance, an American feminist organization
 * Workers Alliance of America, an American political organization
 * Woolclassers' Association of Australia