Sadao may refer to:
Places Sadao, Buachet - Buachet District - Surin Province, North-Eastern Thailand Sadao, Nang Rong - Nang Rong District - Buriram Province, North-Eastern Thailand Sadao, Phlapphla Chai - Phlapphla Chai District - Buriram Province, North-Eastern Thailand Sadao, Sadao - Sadao District - Songkhla Province, Southern Thailand Sadao, Tat Thong - Mueang Yasothon District - Yasothon Province North-Eastern Thailand Sadao district - on the border of Malaysia in Songkhla province, southern Thailand.
Other uses Sadao (given name), a masculine Japanese given name Neem (in Thai: sadao; Khmer: sdao) a tree in the mahogany family Meliaceae