| Billy Colgan | |
| Position: | Catcher |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | Unknown |
| Birth Place: | East St. Louis, Illinois |
| Death Date: | August 8, 1895 |
| Death Place: | Great Falls, Montana |
| Debutleague: | MLB |
| Debutdate: | May 3 |
| Debutyear: | 1884 |
| Debutteam: | Pittsburgh Alleghenys |
| Finalleague: | MLB |
| Finaldate: | October 15 |
| Finalyear: | 1884 |
| Finalteam: | Pittsburgh Alleghenys |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .155 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs scored |
| Stat3value: | 10 |
| Teams: |
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William H. Colgan was an American catcher in Major League Baseball. He played for the 1884 Pittsburgh Alleghenys.