Jigginstown Castle, Tower house and national monument in Naas, Ireland

Jigginstown Castle is a ruined 17th-century house near Naas, County Kildare, built in the late 1630s for Thomas Wentworth, Earl of Strafford. It was one of Ireland's largest buildings and the first constructed of red brick, said to have been imported from Holland. The plans provided for pavement and columns of Kilkenny marble. Only the basement and ground floor remain standing.

Thomas Wentworth, Earl of Strafford, built this residence in the 1630s as a potential royal estate during King Charles I's rule. The project reflected political plans to shape relations between England and Ireland at that time.

The house was planned with pavements and columns of Kilkenny marble, a material quarried in County Kilkenny. It was also known as Siggingstown Castle, a name recorded alongside Jigginstown. The red brick was said to have been imported from Holland, making it the first building in Ireland constructed of that material.

The site can be viewed from outside, though access to the interior may be limited. Wear comfortable shoes as the ground is uneven and there are no developed paths around the ruins.

The plans specified floors and columns of Kilkenny marble, a detail that survives only on paper since the house was never finished. Strafford's biographer Veronica Wedgwood noted that the foundations were still visible in the 1950s, a century after the 1640s destruction.