Opus One Winery is a prestigious winery located in Oakville, California, in the Napa Valley wine region. It is renowned for producing high-quality, Bordeaux-style wines and is known for its collaboration between two prominent wine families, Baron Philippe de Rothschild of Château Mouton Rothschild in Bordeaux, France, and Robert Mondavi of the Robert Mondavi Winery in Napa Valley.