Glanusk Park (Welsh: Parc Glanwysg) is a country estate in Wales, United Kingdom, situated near the town of Crickhowell, Powys and was established in 1826[1] by ironmaster Sir Joseph Bailey.

[8] Today, Glanusk is a well-established and diversified country estate with farming, private residential, commercial, sporting, wedding and holiday-let interests.

[9] The estate is also a premier events venue which hosts, amongst others, the annual Green Man Festival and has previously been the site of Welsh Polo, Glanusk International Horse Trials and a number of smaller events and charitable functions including the annual NGS Open Garden and Estate Fair and Fun Ride.

Shân Legge-Bourke, Lord Lieutenant of Powys and a lady-in-waiting to The Princess Royal, is the (present) owner of the Glanusk estate.

[12][13] In 1876, Glanusk was the scene of a murder when the estate's gamekeeper, George King, was shot whilst he and his under-keeper, Philip Hooper, were trying to apprehend poachers.

The man who was tried and acquitted for the murder was forced to emigrate to America where it is said he received confirmation of a deathbed confession from South Wales.