| 1890 Pittsburgh Alleghenys | |
|---|---|
| League | National League |
| Ballpark | Recreation Park |
| City | Allegheny, Pennsylvania |
| Owner | William A. Nimick |
| Manager | Guy Hecker |
The 1890 Pittsburgh Alleghenys season was the ninth season for the Pittsburgh Pirates franchise. The team finished eighth and last in the National League with a record of 23–113, 66.5 games behind the Brooklyn Bridegrooms.
This was the final season for the team with the name "Alleghenys," as the team changed its name to the Pittsburgh Pirates the next season, a name it has retained to the present day.