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 1865 by George Hazeltine as a supply depot or stagecoach stop along the Dalles-Canyon City wagon road., 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.

John Day is a city located approximately 2 miles (3.2 km) north of Canyon City in Grant County, Oregon, United States, at the intersection of U.S. Routes 26 and 395. The city was named for the nearby John Day River, which, along with Dayville, had been named for a Virginia member of the 1811 Astor Expedition, John Day. The city was incorporated in 1901.