David Duncan (born 1965) is an American vintner and entrepreneur. The President and Chief Executive Officer of , he is also the President and Chief Executive Officer of Silver Oak Cellars and Managing Partner of Twomey Cellars, successful wineries in northern California, operating in the Napa, Alexander and Russian River Valleys. He is the son of late Raymond Twomey Duncan, an oil and wine entrepreneur who co-founded Silver Oak in 1972 with Justin Meyer. Silver Oak is a family-run and owned business, and his brother is Executive Vice President of the company. ColoradoBiz says that David Duncan is "as much a hands-on winery president as he can be", as president of a winery that has "reached cult status" for its Cabernet Sauvignon production.