Cowichan Valley is a region around the Cowichan River and Cowichan Lake on Vancouver Island, in British Columbia, Canada. There is some debate as to the origin of the name Cowichan, which many believe to be an anglicized form of the First Nations tribal name Quw'utsun. This word in turn may be derived from Hul'qumi'num, meaning "the warm land." Others have claimed that the name is a bastardized English form of "cow pasture."

Communities include Duncan, Lake Cowichan, Cobble Hill, Shawnigan Lake, Mill Bay, Ladysmith, Crofton, Chemainus, and Maple Bay.

The Cowichan Valley is the home of a growing number of vineyards and wineries. They include Cherry Point Vineyards, Blue Grouse, Glenterra,Vigneti Zanatta,Venturi-Schulze Vineyards, and Averil Creek. Locals claim that the warm, dry summers and mild, moist winters are reminiscent of a cool Mediterranean climate, providing ideal growing conditions for many grape varieties.