Longniddry (Scots: Langniddry, Scottish Gaelic: Nuadh-Treabh Fada)[2] is a coastal village in East Lothian, Scotland, with an estimated population of 2,340 in 2022.

Longniddry is primarily a dormitory village for commuters, with good transport links by road and rail (Longniddry railway station is on the North Berwick Line) to the capital, some 12 miles to the West.

Like many coastal towns in East Lothian, Longniddry has a sandy beach beside the golf course.

The 18th century Gosford House, which is the seat of the Earl of Wemyss and March, stands on the eastern edge of the village.

In 1917 the first meeting of the Scottish Women's Rural Institute took place in Longniddry organised by Catherine Hogg Blair.