Longniddry, a village in Gladsmuir parish, Haddingtonshire, with a post and railway telegraph office, and with a station on the North British railway, the junction for Haddington, 4¾ miles WSW of that town and 13½ E by N of Edinburgh. Once a small town of some importance, with several streets, it covered a considerable extent of ground, which now is under the plough. Today it exhibits a straggling, irregular, and decayed appearance; although, in connection with the railway, it still is a place of some transit traffic. Longniddry House, the seat of the Douglases, who figured prominently in the movements of the Reformation, stood at the SW side of the village, and is now represented by only a circular mound and subterranean vaults. An ancient chapel, in which John Knox occasionally preached, and which came to be called John Knox's Kirk, stood a little to the E, and is now a ruin.—Ord. Sur., sh. 33, 1863.

(F.H. Groome, Ordnance Gazetteer of Scotland (1882-4); © 2004 Gazetteer for Scotland)