| Team: | Ottawa Rough Riders |
| Teamdisplay: | Ottawa Senators |
| Year: | 1925 |
| Record: | 4–1–1 |
| League Place: | 1st, IRFU |
| Coach: | Dave McCann |
| Playoffs: | Won Grey Cup |
| Shortnavlink: | Ottawa Senators seasons |
The 1925 Ottawa Senators finished in first place in the Interprovincial Rugby Football Union with a 4–1–1 record and won the first Grey Cup in franchise history by defeating the Winnipeg Tammany Tigers 24–1 at Lansdowne Park.
| Ottawa Senators | 6 | 4 | 1 | 1 | 48 | 24 | 9 | |
| 6 | 3 | 3 | 0 | 27 | 43 | 6 | ||
| 6 | 2 | 3 | 1 | 37 | 42 | 5 | ||
| 6 | 2 | 4 | 0 | 39 | 42 | 4 |
| Week | Date | Opponent | Score | Result | Record | |
| 1 | Oct 3 | vs. Montreal AAA Winged Wheelers | 17–1 | Win | 1–0 | |
| 2 | Oct 10 | at Toronto Argonauts | 13–5 | Loss | 1–1 | |
| 3 | Oct 17 | vs. Toronto Argonauts | 9–4 | Win | 2–1 | |
| 4 | Oct 24 | at Montreal AAA Winged Wheelers | 7–1 | Win | 3–1 | |
| 5 | Nov 7 | at Hamilton Tigers | 2–2 | Tie | 3–1–1 | |
| 6 | Nov 14 | vs. Hamilton Tigers | 8–3 | Win | 4–1–1 |
| Round | Date | Opponent | Score | Result | Record | |
| Eastern Final | Nov 28 | vs. Queen's Golden Gaels | 11–2 | Win | 5–1–1 | |
| Grey Cup | Dec 5 | vs. Winnipeg Tammany Tigers | 24–1 | Win | 6–1–1 |