Donald Walter Steinmetz (September 19, 1924 – August 31, 2013) was an American lawyer and judge.

Born in Milwaukee, Wisconsin, Steinmetz served in the United States Army Air Forces during World War II.

In 1964, he was the preferred candidate of Democratic leaders, including Governor John W. Reynolds, Jr., to replace deceased Milwaukee County District Attorney William McCauley, but the post went to Hugh O'Connell.

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