William George Duzen (February 21, 1870 – March 11, 1944), was a Major League Baseball pitcher. He played in two games with the Buffalo Bisons in 1890. 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. Duzen would pitch in a second game on September 27, the final game of his career. 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.