| Dan Long | |
| Position: | Outfielder |
| Birth Date: | 27 August 1867 |
| Birth Place: | Boston, Massachusetts |
| Death Place: | Sausalito, California |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | August 27 |
| Debutyear: | 1890 |
| Debutteam: | Baltimore Orioles |
| Finalleague: | MLB |
| Finaldate: | October 15 |
| Finalyear: | 1890 |
| Finalteam: | Baltimore Orioles |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat2label: | Hits |
| Stat3label: | Runs |
| Stat1value: | .156 |
| Stat2value: | 12 |
| Stat3value: | 19 |
| Teams: |
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Daniel W. Long (August 27, 1867 – April 30, 1929) was an American baseball player. He was an outfielder in Major League Baseball and played for the Baltimore Orioles of the American Association in 21 games in 1890. He was born in Boston, Massachusetts.