Bonnechere Valley is a township municipality in Renfrew County, Ontario, Canada.

It was established on January 1, 2001, by amalgamation of the village of Eganville and the townships of Grattan, Sebastapol, and South Algona.

The township also comprises the smaller communities of Augsburg, Castile, Clontarf, Constant Creek, Cormac, Dacre, Donegal, Esmonde, Grattan, Lake Clear, McGrath, Perrault, Ruby, Silver Lake, Scotch Bush, Vanbrugh, Woermke, and Zadow, as well as the ghost towns of Newfoundout, Balaclava and Foymount.

The power of the Bonnechere River has been harnessed since 1848 but it was John Egan's grist mill that gets credit for stimulating the area's economic growth.

A year later, the Municipal Building was erected, and served as the village post office for almost a century.