Elkanah Watson House is a National Historic Landmark located in Port Kent, New York. The formal stone house overlooks Lake Champlain to the east and was designed by Sheldon & Merritt. It was constructed under the supervision of Charles Watson as the residence of his father, Elkanah Watson. It originally occupied a small portion of Watson's 5,000-acre property on the lake, but pieces were later sold off and have been developed for other residences. The house is located on the southwest corner of Lake Street and South Street in Port Kent.