LONGNIDDRY, a village, in the parish of GladsMUiR, county of Haddington, 4 miles (\V. by N.) from Haddington; containing 216 inhabitants. This village, which is irregularly built, is situated within half a mile of the Firth of Forth, and has a station on the line of the North-British railway. It appears to have been once of much greater extent than at present; a considerable portion of the site of ancient buildings is now in a state of cultivation, and in the memory of persons yet living there were several ranges of houses, the foundations of which have been obliterated by the plough. Part of the old mansion of the Douglases, here, is still occupied by a tenant; and near it are the remains of the ancient chapel, called, from Knox's having preached in it, John Knox's Kirk. See Gladsmuir.