| Steve Dunn | |
| Position: | First baseman |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 21 December 1858 |
| Birth Place: | London, Ontario |
| Death Place: | London, Ontario |
| Debutleague: | MLB |
| Debutdate: | September 27 |
| Debutyear: | 1884 |
| Debutteam: | St. Paul Saints |
| Finalleague: | MLB |
| Finaldate: | October 13 |
| Finalyear: | 1884 |
| Finalteam: | St. Paul Saints |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .250 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 0 |
| Teams: |
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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.