Sadao Araki a Japanese soldier, member of nobility (Baron), politician, and political philosopher born in Tokyo.

Neem, a tree in the mahogany family Meliaceae.

Sadao Yamanaka a Japanese film director and writer in the 1930s.

Sadao Munemori posthumous recipient of the Medal of Honor.

Sadao Watanabe (artist) ()

Sadao Bekku Japanese classical composer.

Sadao Fuchigami (渕上 貞雄 Fuchigami Sadao) Japanese politician.

Sadao Sei (清貞雄) Japanese astronomer.

Sadao Watanabe (musician) ()

The town Sadao and the surrounding Sadao district on the border of Malaysia in the Songkhla Province, southern Thailand.