William John Gies (February 21, 1872 – May 20, 1956) was an American biochemist and dentist.

Gies was born February 21, 1872, in Reisterstown, Maryland.

He co-founded the School of Dentistry at Columbia, leading to the creation of the American Association of Dental Schools.

He was elected to the American Philosophical Society in 1915.

[2] He published a landmark report in 1926 on Dental Education in the US and Canada.