Oak Knoll Winery is a privately held winery located in the Tualatin Valley near Hillsboro, Oregon, United States. Established in 1970, it is the oldest winery in Washington County, and produces Pinot noir, Pinot gris, and Chardonnay. The winery also known for producing Frambosia, a red raspberry wine. Oak Knoll does not have its own vineyards, instead purchasing grapes from area Willamette Valley grape producers.