| Competition: | Cymru Alliance |
| Season: | 1997–98 |
| Winners: | Rhydymwyn |
| Relegated: | Penycae Chirk AAA Llanidloes Mold Alexandra |
| Prevseason: | 1996–97 |
| Nextseason: | 1998–99 |
The 1997–98 Cymru Alliance was the eighth season of the Cymru Alliance after its establishment in 1990. The league was won by Rhydymwyn.