Wao or WAO may refer to:
Places Wao, Lanao del Sur, a municipality in the Philippines Wao State, a former princely state in Banas Katha, Gujarat, India
Other uses Wao language, a language isolate of the Amazon rainforest Wappo language, an extinct language of North America West Australian Opera Wet air oxidation Women's Aid Organisation, a Malaysian non-governmental organization World Allergy Organization World Autism Organisation Yōka Wao (born 1968), Japanese actress Oscar Wao, protagonist of The Brief Wondrous Life of Oscar Wao "Wao!!", 2022 debut single of Hakui Koyori
See also Wow (disambiguation)