Knoxdale-Merivale (Ward 9) is a city ward in Ottawa, Ontario. Located in the city's west end, the ward is bordered to the east by the Rideau River and Fisher Avenue, the northern boundaries of the community of Barrhaven to the south, Ontario Highway 416 and Cedarview Road to the west and to the north by the Canadian National railway west of Merivale Road and Baseline Road to its east. It includes the communities of portions or all of Arlington Woods, Craig Henry, Tanglewood, Manordale, Crestview, Skyview, Parkwood Hills, Merivale Gardens, Grenfell Glen, Pineglen and Country Place.

Prior to 1994, Nepean elected its regional councillors on an at large basis.

1. Gord Hunter (1994–2010)
2. Keith Egli (2010–2022)
3. Sean Devine (2022–present)