| 1908 Ottawa Rough Riders season | |
|---|---|
| Head coach | Tom Clancy |
| Home field | Lansdowne Park |
| Results | |
| Record | 5–1 |
| League place | 1st, IRFU |
| Playoff finish | Lost League Playoff |
The 1908 Ottawa Rough Riders finished in first place in the Interprovincial Rugby Football Union with a 5–1 record and qualified for the IRFU playoffs for the first time since its inception in the previous year. The Rough Riders were defeated by the Hamilton Tigers in a league playoff.