The Kam Wah Chung & Co. Museum, also known as Kam Wah Chung Company Building, is a state park and a National Historic Landmark that preserves early Chinese culture in John Day in the U.S. state of Oregon. Built in the 1870s, possibly as a trading post, it is the best-preserved example of a Chinese herbal apothecary and mercantile establishment dating to the post-Civil War period of growth in the Western United States.