Greencastle is a commercial fishing port located in the north of the scenic Inishowen Peninsula on the north coast of County Donegal, Ireland.
Nowadays, given the decline in the fishing industry, it resembles more closely a 'typical' Donegal holiday village. It is located a few miles from Moville and is about 20 miles from Derry. Greencastle's name comes from the castle in the area, which, in turn, may have derived its name from the green freestone with which it was built. The castle, originally built by the Anglo-Normans, is also known as Newburgh Castle.
The first proper pier was built in 1813 and has been added to several times since. Today, as well as being a tie up for trawlers and salmon boats and the home of the Greencastle Fishermen's Co-Op, the Foyle Fishermen's Co-Op and Fresco Seafoods, the pier also has a very different "catch". Visitors disembark from the Magilligan-Greencastle ferry which was inaugurated in 2002.