Ardglass (from Irish Ard Ghlais, meaning "green height") is a coastal fishing village, townland (of 321 acres) and civil parish in County Down, Northern Ireland, in the historic barony of Lecale Lower. It is still a relatively important fishing harbour. It is situated on the B1 Ardglass to Downpatrick road, about 6 miles (11 kilometres) to the south east of Downpatrick, in the Lecale peninsula on the Irish Sea. It had a population of 1,668 people in the 2001 Census, and is located within the Down District Council area.