The Chiltern District Welsh Society will be visiting Cliveden House on Thursday May 19.
The event will be free for National Trust members but will cost £2 plus a charge for the tour of the house for non members, although a group discount is a possibility if there is enough interest.
Society members are asked to make their own way there.
The tours will be scheduled for around 4pm. Meet at the Orangery between 3.15 and 3.30pm.