| Country: | Scotland |
| Official Name: | Longniddry |
| Gaelic Name: | Nuadh-Treabh Fada |
| Scots Name: | Langniddry |
| Static Image Name: | Links Road, Longniddry.jpg |
| Static Image Caption: | Links Road, Longniddry |
| Population Ref: | |
| Os Grid Reference: | NT442761 |
| Edinburgh Distance Mi: | 11.5 |
| London Distance Mi: | 329 |
| Coordinates: | 55.975°N -2.894°W |
| Pushpin Map: | Scotland East Lothian |
| Civil Parish: | Gladsmuir |
| Unitary Scotland: | East Lothian Council |
| Lieutenancy Scotland: | East Lothian |
| Constituency Westminster: | East Lothian |
| Constituency Scottish Parliament: | East Lothian |
| Post Town: | LONGNIDDRY |
| Postcode District: | EH32 |
| Postcode Area: | EH |
| Dial Code: | 01875 |
Longniddry (Scots: Langniddry, Gaelic; Scottish Gaelic: Nuadh-Treabh Fada)[1] is a coastal village in East Lothian, Scotland, with an estimated population of in . The Scottish Women's Rural Institute was founded here in 1917.
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.The village has a number of local, community based resources including local shops and Longniddry Community Centre, which also houses the library. Near to the library is the Scout Hall used by the Longniddry Scout Group.[2] The golf course hosted the Carling-Caledonian Tournament in 1961. Like many coastal towns in East Lothian, Longniddry has a sandy beach beside the golf course.[3] This stretch of local coastline is lined with dunes and known as Longniddry Bents.
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. 37 women became members.[4]
In 2006, Longniddry and the neighbouring towns of Prestonpans, Cockenzie and Port Seton were twinned with the town of Barga, Tuscany, Italy.[5]