William George Duzen (February 21, 1870 – March 11, 1944) was an American Major League Baseball pitcher.

Duzen was born in Buffalo, New York in 1870.

On September 21, 1890, at the age of 20, he made his Players' League as a starting pitcher for the Buffalo Bisons.

In his two career games, he lost both of his starts, gave up 20 earned runs in 13.0 innings, and struck out five batters.

This biographical article relating to an American baseball pitcher born in the 1870s is a stub.