Keizō Saji (佐治敬三 Saji Keizō?, November 1, 1919 – November 3, 1999) was a Japanese businessman and art patron.
He is the son of Shinjiro Torii who founded Suntory. The Japanese company is a maker of beer and whiskey.
Saji was the founder of the Suntory Art Museum and the Suntory Music Foundation in Tokyo.