Haddington, town (1991 pop. 8,842), East Lothian, SE Scotland. It has a large corn exchange. Farm machinery and textiles are manufactured, flour is milled, and grain is malted in the town. Hides are also traded. Haddington was burned by raiding English armies in 1216, 1244, and 1355. Giffordgate, a suburb, was the birthplace of the Protestant reformer John Knox. Lennoxlove, built for Frances Stuart, mistress of Charles II, is a seat of the dukes of Hamilton.