Stephen B. Dunn (December 21, 1858 – May 5, 1933) was a Major League Baseball first baseman in the 19th century. He played for the St. Paul Saints of the Union Association, a replacement team which began major league play near the end of the 1884 season.

In 9 games as the Saints' starting first baseman Dunn batted .250 (8-for-32) with two runs scored. He fielded well at first base (.972) and also played part of one game at third base.

A native of London, Ontario, Canada, he died in his hometown at the age of 74.

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