Proleek Dolmen, Neolithic portal tomb in County Louth, Ireland.

Proleek Dolmen is a portal tomb about 3.8 m high in the townland of Proleek on the Cooley Peninsula, County Louth. Two upright portal stones and a lower backstone carry a granite capstone roughly 3.8 m long, 3.2 m wide and 40 tonnes, giving the monument the look of a figure bent under its weight. The portal faces northwest; 80–90 m away stands a wedge tomb with a gallery about 6 m long.

Proleek Dolmen was built around 3000 BC in the Neolithic period and used for cremated burials with grave goods such as tools, beads and pottery. Its portal may be aligned toward Slieve Gullion or the setting sun at the summer solstice. The antiquarian Thomas Wright published an engraving of it in Louthiana in 1742.

Local legend says that anyone who lands three stones on top of the dolmen will be granted a wish or be married within the year. Visitors leave pebbles on the convex surface of the 40-tonne capstone. The dolmen is also tied to the giant Parrah Boug M'Shagjean, said to have carried the stones from the neighbouring mountains.

The monument is located on Ballymascanlon Hotel's golf course and requires permission from hotel staff to access the walking paths. Entry is on foot, but it is best to check ahead and follow the hotel's guidelines.

About 90 meters southeast stands Giant's Grave, a wedge-shaped gallery tomb with its own archaeological importance. This second structure makes the site a complex with multiple prehistoric elements.