Longkesh is a small village in County Antrim, Northern Ireland, near Lisburn. In the 2001 Census it had a population of 201 people. It is situated in the Lisburn City Council area.
Longkesh is best known as the site of Long Kesh prison. It was converted from a Royal Air Force base in 1971 into a 'temporary' camp for republican internees. Later, it was expanded to house sentenced republican and loyalist prisoners; and in 1976 was divided in two when the British government opened the H-Blocks.